euston brick banks / black marble banks are awesome. southbank obviously yeah. theres some really fun black banks by the 'southhampton buildings' in holborn/chancery lane and then at LSE down the road there some steep wallride things, and around 29 whitefriars street if you climb in behind the plants theres some fun small ones, shepherds bush in front of the mariot hotel some red brick ones, by SOAS univeristy theres some tall crusty ones. in wandsworth (pretty far out) are all the banks you've probably seen in Clockwork Orange. outside pimlico station theres a bank thing, lots of places you'll come across small brick/concrete banks jsut skating around too (quite a lot in north london where i live ) and just lots more in general i cant think of off the top of my head right now. PM if u want any directions
also some mellow ones just down from highbury and islington station (about 50 holloway road)