Deputy Prime minister and Leader of the Liberal Democrats, Nick Clegg, talks to the FT on a train to his constituency in Sheffield.

Charlie Bibby/FT

Deputy Prime minister and Leader of the Liberal Democrats, Nick Clegg is photographed during an interview on a train. Clegg was on his way to his constituency in Sheffield 

People walk in front a poster of prominent attendees of the 1955 Asian-African Conference on Asia Afrika street in Bandung...People walk in front a poster of prominent attendees of the 1955 Asian-African Conference on Asia Afrika street in Bandung, Indonesia, April 24, 2015. Leaders of Asian and African nations attended a commemoration ceremony on Friday marking 60 years since the commemoration of the Asian-African Conference.  REUTERS/Beawiharta

Beawiharta/Reuters

People walk in front a poster of prominent attendees of the 1955 Asian-African Conference on Asia Afrika street in Bandung, Indonesia

An elderly woman sits on ground as she is blocked by barricade of policemen while marching down street during rally in central Seoul...An elderly woman sits on the ground as she is blocked by a barricade of policemen while marching down the street during a rally in central Seoul, South Korea, April 24, 2015. About 260,000 workers took part in the nationwide one-day strike, including about 60,000 government employees and 10,000 teachers, according to the Korean Federation of Trade Unions. They protested against the government's push to cut pensions and ease rules for firing employees, according to local media.  REUTERS/Kim Hong-Ji

Kim Hong-Ji/Reuters

An elderly woman sits on the ground as she is blocked by a barricade of policemen while marching down the street during a rally in central Seoul, South Korea. About 260,000 workers took part in the nationwide one-day strike, including about 60,000 government employees and 10,000 teachers, according to the Korean Federation of Trade Unions. They protested against the government’s push to cut pensions and ease rules for firing employees, according to local media 

ATTENTION EDITORS - CAPTION CORRECTION FOR LON101 TRANSMITTED ON APRIL 23, 2015 AT APPROXIMATELY 0830 GMT...ATTENTION EDITORS - CAPTION CORRECTION FOR LON101 TRANSMITTED ON APRIL 23, 2015 AT APPROXIMATELY 0830 GMT. THE CAPTION INCORRECTLY MENTIONS A PUSH CHAIR. A CORRECTED VERSION IMMEDIATELY FOLLOWS THIS ADVISORY. WE ARE SORRY FOR ANY INCONVENIENCE CAUSED. REUTERS.  A woman walks past a piece of street art depicting a pregnant Catherine, Duchess of Cambridge, in north London, April 23, 2015. The Duchess is due to give birth to her second child in the next few days.  REUTERS/Cathal McNaughton TPX IMAGES OF THE DAY  TEMPLATE OUT

Cathal McNaughton/Reuters

A woman walks past a piece of street art depicting a pregnant Catherine, Duchess of Cambridge, in north London. The Duchess is due to give birth to her second child in the next few days. 

Soldiers stand guard in front of the Tsitsernakaberd Memorial in Yerevan

Kirill Kudryavtsev/AFP/Getty

Soldiers stand guard in front of the Tsitsernakaberd Memorial in Yerevan, during a commemoration ceremony for the 100th anniversary of the Armenian genocide.

APTOPIX Bangladesh Building Collapse Anniversary

A.M. Ahad/AP

A relative cries in front of a monument erected in memory of the victims of Rana Plaza building collapse, as they gather at the spot on its second anniversary in Savar, Bangladesh, on Friday.

Women wearing sevillana dresses are seen during the traditional Feria de Abril (April fair) in the Andalusian capital of Seville...ATTENTION EDITORS: SPANISH LAW REQUIRES THAT THE FACES OF MINORS ARE MASKED IN PUBLICATIONS WITHIN SPAIN Women wearing sevillana dresses are seen during the traditional Feria de Abril (April fair) in the Andalusian capital of Seville, southern Spain, April 23, 2015. The fair will run until April 26.  REUTERS/Marcelo del Pozo        TPX IMAGES OF THE DAY

Marcelo del Pozo/Reuters

Women wearing sevillana dresses are seen during the traditional Feria de Abril (April Fair) in the Andalusian capital of Seville, southern Spain

This undated photo provided by NASA shows an image taken by the Hubble Space Telescope showing a giant star cluster in the Constellation Carina, about 20,000 light years from Earth. Friday, April 24, 2015, marks the 25th anniversary of Hubble's launch

NASA/ESA/Hubble Heritage Team/AP

NASA shows an image taken by the Hubble Space Telescope showing a giant star cluster in the Constellation Carina, about 20,000 light years from Earth. Friday marks the 25th anniversary of Hubble’s launch

Young Yemenis play football on a street in Sanaa, Yemen on Thursday. Schools and universities have remained closed in Sanaa and several Yemeni cities since the Saudi-led coalition began its military operations on positions held by the Houthis and their allies across the country

Yahya Arhab/EPA

Young Yemenis play football on a street in Sanaa, Yemen on Thursday. Schools and universities have remained closed in Sanaa and several Yemeni cities since the Saudi-led coalition began its military operations on positions held by the Houthis and their allies across the country

An anti-xenophobia activist stands chained in front of a banner, as thousands of people get ready to march against the recent wave of xenophobic attacks in South Africa through the streets of Johannesburg CBD on April 23, 2015. President Jacob Zuma pledged to tackle xenophobia in South Africa as troops were sent in to support police in a crackdown against attacks on immigrants that have left at least seven people dead

Gianluigi Guercia/AFP

An anti-xenophobia activist stands chained in front of a banner, as thousands of people get ready to march against the recent wave of xenophobic attacks in South Africa through the streets of Johannesburg CBD on Thursday

Ring-tailed lemurs are pictured at Zoom ...Ring-tailed lemurs are pictured at Zoom Torino, a zoological park in Cumiana near Turin, on April 22, 2015. Zoom Torino is a new immersive zoological park, where animals can be seen without bars or cages, only natural barriers ensure the visit. AFP PHOTO / MARCO BERTORELLOMARCO BERTORELLO/AFP/Getty Images

Marco Bertorello/AFP/Getty

Ring-tailed lemurs are pictured at Zoom Torino, a zoological park in Cumiana near Turin, Zoom Torino is a new immersive zoological park, where animals can be seen without bars or cages, only natural barriers ensure the visit

A child of a party activist waits for Britain's Prime Minister David Cameron to deliver a speech at a regional campaign launch in Penzance on Thursday in Penzance, England. Britain goes to the polls in a General Election on May 7

Toby Melville/Reuters

A child of a party activist waits for Britain’s Prime Minister David Cameron to deliver a speech at a regional campaign launch in Penzance on Thursday in Penzance, England

Over 200 illegal migrants, before they are shipped to the Italian mainland after being rescued by Italian Guardia di Finanza boat 'Denaro' in the Mediterranean Sea

Alessandro Di Meo/EPA

Over 200 illegal migrants cram into a boat as they are shipped to the Italian mainland after being rescued by Italian Guardia di Finanza boat ‘Denaro’ in the Mediterranean Sea

A passenger bathes an child using a pipe that supplies water to trains at a railway station on a hot summer day in the northern Indian city of Allahabad April 23, 2015. Temperatures in Allahabad on Thursday reached to 42 degree Celsius (107.6 degree Fahrenheit), according to India's metrological department website

Jitendra Prakash/Reuters

A passenger bathes a child using a pipe that supplies water to trains at a railway station on a hot summer day in the northern Indian city of Allahabad. Temperatures in Allahabad on Thursday reached to 42 degree Celsius

An aerial shot shows the skylines of Hon...An aerial shot shows the skylines of Hong Kong island (foreground) and Kowloon (back L) separated by Victoria harbour on April 23, 2015, a day after the city's government unveiled its Beijing-backed plan for leadership elections in 2017. Britain handed Hong Kong over to China in 1997 under a joint declaration which guaranteed political, social and economic freedoms not enjoyed on the Chinese mainland.  AFP PHOTO / Philippe LopezPHILIPPE LOPEZ/AFP/Getty Images

Philippe Lopez/AFP/Getty

An aerial shot shows the skylines of Hong Kong island (foreground) and Kowloon (back left) separated by Victoria harbour. The city’s government on Wednesday unveiled its Beijing-backed plan for leadership elections in 2017.

Steam Train Provides Link Between China's Past And Present...SHIXI, CHINA - MARCH 27: Workers service  a local coal powered steam train before departing on a trip carrying local villagers on March 27, 2015 at a station in the town of Shixi , Sichuan Province, in Southern China. While China boasts the world's most extensive high-speed rail infrastructure with over 16,000 kilometers of track, the Shixi-Bagou railway is still a primary connection for local villagers between towns and is kept alive by tourist cars carrying passengers for ten times the price. The rail line came into service in the late 1950s and the train was initially used to transport coal from a now-shuttered mine before passenger carriages were added.  (Photo by Kevin Frayer/Getty Images)

Kevin Frayer/Getty

China boasts the world’s most extensive high speed rail network with more than 16,000 km of track, but steam trains still have a role to play. The Shixi-Bagou railway connects the two towns and is kept going by tourist cars carrying passengers for ten times the price locals pay. The rail line came into service in the late 1950s and the train was initially used to transport coal from a now-shuttered mine before passenger carriages were added. 

Smoke and ash rise from the Calbuco volcano as seen from the city of Puerto Montt, April 22, 2015. The Calbuco volcano in southern Chile erupted for the first time in more than five decades on Wednesday, sending a thick plume of ash and smoke several kilometres into the sky.

Sergio Candia/Reuters

Smoke and ash rise from the Calbuco volcano as seen from the city of Puerto Montt. The volcano in southern Chile erupted for the first time in more than five decades, sending a thick plume of ash and smoke into the sky.

Wider Image: Renting in Mumbai Per Square Foot...Residents look out of windows of an apartment in Mumbai March 15, 2015. The cost for buying a 200 square feet (18 square meters) one-bedroom apartment in this building is around 25,000 Indian rupees per square feet ($ 400) or 5,000,000 Indian rupees ($ 80,000). The rent for an apartment in the same building is around 12,000 Indian rupees ($ 190) per month. REUTERS/Danish Siddiqui  TPX IMAGES OF THE DAY PICTURE 05 OF 22 FOR WIDER IMAGE STORY "RENTING IN MUMBAI PER SQUARE FOOT" SEARCH "RENTING SIDDIQUI" FOR ALL IMAGES

Danish Siddiqui/Reuters

Residents look out of windows of an apartment in Mumbai, India. The cost of buying a 200 sq ft one-bedroom apartment in this building is around Rs5m ($80,000). The rent for an apartment in the same building is around Rs12,000 ($190) per month 

School children from Belgium sit on a tank on display as they listen to an Israeli soldier speaks about Israel's wars, near the wall of names of fallen soldiers, at the Armored Corps memorial, before a ceremony marking the annual Memorial Day for soldiers and civilians killed in more than a century of conflict between Jews and Arabs, in Latrun near Jerusalem, Israel, Wednesday, April 22, 2015. Israel came to a standstill on Wednesday as sirens wailed across the country on its annual Memorial Day for fallen soldiers and victims of terrorism.

Ariel Schalit/AP

School children from Belgium sit on a tank on display listening to an Israeli soldier speaking about Israel’s wars, at the Armoured Corps memorial. A ceremony was held in Latrun near Jerusalem, Israel, on Wednesday to mark the annual Memorial Day for soldiers and civilians killed in more than a century of conflict between Jews and Arabs

A woman walks under an umbrella during a sudden hail-storm on Wednesday, in Istanbul

Bulent Kilic/AFP

A woman walks under an umbrella during a sudden hail storm on Wednesday in Istanbul