It depends on what you have seen. Obviously: The Producers on Drury lane down in Covent Garden and the Lion King is down there too; Les Mis, which has moved to the Queens up by Leicester Sq ; are [still] the big shows in town. Tick, Tick, Boom is OK. The woman in White, at the palace on the corner of Shaftsbury Av. and Charing cross rd is pretty poor. Also avoid the queen musical 'We will rock you' up on Tottenham Court Road, unless you're a queen fan, of course. If you're feeling extravagant there's always the royal opera house, also in Covent Garden or check out the barbican up in, well, barbican which often has some good stuff on.
"the cottagers at Rotherhithe knew something of his name. From Hammersmith to Putney people shuddered at his name" - Growltiger's Last Stand