For more information specifically on London, visit one of the following:
The official London Web site is www.visitlondon.com, which supplies event information and has accommodations booking with guaranteed lowest rates: if you book through its site and then find a lower price at the same hotel within 24 hours, they'll refund the difference.
Other sites of interest include www.londontown.com, the Evening Standard's online www.thisislondon.com, Transport for London (www.tfl.gov.uk), No. 10 Downing Street (www.number-10.gov.uk), and the BBC (bbc.co.uk).
For London events and news months in advance, visit the following culture and entertainment Web sites: www.timeout.co.uk, www.officiallondontheatre.co.uk, and www.kidslovelondon.com. At www.londonfreelist.com you can find great listings of free and nearly free events and attractions.