Mega City Comics
Nice and friendly comic shop in the Camden Town. They stock a very wide range of titles ranging from a full line of mainstream Marvel & DC titles, through all the major indies, a dedicated 'Goths' section crammed with Lenore, JTHM, Edward Gorey, some great Tim Burton books and merchandise, Emily Strange & Ruby Gloom. There is a decent Manga section, some really great t-shirts which you don't find in many of the other shops, plus a sub-culture and fetish section for the more experimental mind!
Have used the website, and the service is excellent - really easy to use and very fast delivery.
All round a very nice shop.