Monmouth
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Cafe Monmouth will be the meeting place for Drupalgangers during DrupalCon 2011. It is one of the best places in London to have a cup of coffee: both single and a double shots are the same price - £1.35 which is one of the lowest prices for coffee in London. The pastries are great too. The atmosphere is charming and the staff are very friendly.
http://www.monmouthcoffee.co.uk/Shops/The-Borough
They make single cone filter coffee and espresso based drinks with organic Jersey whole milk from Somerset and organic whole cane sugar from Costa Rica.
Address
2 Park St, Borough Market, London SE1 9AB