Kirsty and Ivanhoe have both given good advice. I just wanted to expand on the postcode information, though, as I'd hate anyone to buy in SE2 thinking it's just a hop, skip and a jump away from central London...
London has eight postal areas: E, EC, N, NW, SE, SW, W and WC. Confusingly, the postal areas S and NE aren't in London (though they used to be until the 1860s). The postal areas EC and WC are the most central, followed by those with a "1" after the postal area (E1, SE1, SW1, W1, N1 and NW1), but after that the postal districts are numbered alphabetically by the name of the district. For example,
SE2 = Abbey Wood, SE3 = Blackheath, SE4 = Brockley, SE5 = Camberwell,
E2 = Bethnal Green, E3 = Bow, E4 = Chingford,
W2 = Bayswater, W3 = Acton, W4 = Chiswick, W5 = Ealing, W6 = Hammersmith,
Sometimes this means that consecutive postal districts adjoin each other, e.g. W2 (Bayswater) is next to W1, and E2 (Bethnal Green) is next to E1, but sometimes they don't, e.g. SE2 (Abbey Wood) isn't next to SE1, and NW2 (Cricklewood) isn't next to N1; both SE2 and NW2 are quite far from central London.
The SE postcodes are a bit more complicated as the SE area was expanded to include SE19 (I think) to SE28 some time ago, so all of these postcodes are further out than SE1 - SE18. (This might be the case in other areas of outer London as well, I'm not sure.)
has summaries of each area that could be quite useful.
Edited 1 times. Last edit at 17 June 2005 5.02pm by The Lady Miss Jo Jo.