Any hairdresser recommendations for a long haired bloke in hunt for style?

I have long fly away hair that has not been cut for years. It is so bad the split ends have got down to a fourth generation.

So could somebody please recommend a stylist/hair dresser that might be able to help? I don't want it all cut off, I just need suggestions to have it reduced and tidied.

I work not too far from Tate Modern and would like to go after work, somewhere not too extortionate but friendly and capable please ;o)

Thanks!