For those who haven't left work yet, here's the latest from TFL:
4.55pm Services are currently operating as follows and include service suspensions that were already in effect following incidents on 7 July 2005.
Bakerloo - suspended between Paddington to Piccadilly Circus
Central - normal service
Circle - suspended
District - suspended between Edgware Road and High Street Kensington
East London - normal service
Hammersmith & City - suspended
Jubilee - normal service
Metropolitan - suspended between Baker Street to Aldgate
Northern - operating between Morden to Stockwell and Kennington to Edgware via Bank only
Piccadilly - operating between Cockfosters and Arnos Grove only
Victoria - operating between Walthamstow to Highbury & Islington and between Victoria to Brixton
Waterloo & City - normal service
Warren St, Oval and Shepherd's Bush (Hammersmith & City) stations remain closed