Here are my photos from a weekend in London (19th and 20th February 2011).
The only big downside was the weather, with a cloudy, overcast sky sticking around all weekend. The first day (Saturday 19th) consisted of on Regent St and Oxford St, with a walk around Piccadilly Circus, Victoria Embankment and Leicester Square.
The second day (Sunday 20th) started off with a trip on the London Eye, before i went on a mini adventure across London. From Waterloo to Canary Wharf, Canary Wharf to North Greenwich, North Greenwich to West Ham, West Ham to Liverpool St. Then, Liverpool St to Tower Hill, Tower Hill to Westminster, WestMinster to Embankment, Embankment to Piccadilly Circus, Piccadilly Circus to Leicester Square, and finally Leicester Square to Waterloo. All of this enabled me to have quite a decent amount of time getting some night shots.