There's a brand new old-fashioned tea room/cafe just opened on Old St, about 10 mins walk from Old St Tube on the Northern Line. It's totally vegan and sells a very wide range of cakes.
I popped in on the opening day to sample plum frangipane and a chewy choc chip cookie with a pot of tea. Prices were reasonable for the location, though my friend's "cappuccino" was just a basic milky white coffee, so they need to sort that out.
* Plus points: gorgeous cake, great location, all-vegan
* Minus points: no toilet, narrow doorway with a step up would make things difficult for disabled people and those with pushchairs.http://www.octobercafe.co.uk/