Midnight - 'Soho', by Karen Shivas.
1am - 'Canary Wharf', by Bill Green.
2am - 'Cable Car', by Lucas More.
3am - 'The Commuter', by Elliot Kell.
4am - 'London', by Mike Deere.
Launched in 2007, the Urban Photographer of the Year now receives around 8,000 entries from more than 115 countries.
5am - 'Perfect Timing', by Teodoro Duran.
6am - 'Rise', by James Murray.
7am - 'Vertical', by David Candlish.
This collection of photos show some of the entries from the competition's 2013 challenge.
8am - 'Fitness', by Nagy Melinda.
9am - 'The Bridge', by Nicolas Casana.
10am - 'City Hall', by Stuart Kerr.
11am - 'Snap in Time', by Stephen Miller.
Midday - 'Time Out', by David Candlish.
The theme "Cities at Work" is designed to challenge amateur and professional photographers to capture what they consider to be the essence of urban life at any time of day, be it poignant, inspiring, quirky or amusing