City of London

The Canary Wharf financial district and central London emerge from morning fog in this aerial photograph released by the Metropolitan Police in London

Metropolitan Police/Reuters

The Canary Wharf financial district emerges from Thursday’s morning fog , with central London in the background

A group of Morris Dancers perform as part of St George's Day celebrations in Leadenhall Market, in the City financial district of London. PRESS ASSOCIATION Photo. Picture date: Tuesday April 23, 2013.

Dominic Lipinski/PA

A group of Morris Dancers perform as part of St George’s Day celebrations in Leadenhall Market, in the City financial district of London.