Barbican Centre

This is a pretty decent place to work, the staff don't bother you and don't care if you don't buy anything, and you can work until 11pm on the days the building is open late. It's also one of the few places where you can work late on a Sunday. You can work from the 'Kitchen' restaurant (even if you don't buy anything), outside on the terrace, on the large tables in the main foyer, or upstairs in the bar. The Kitchen closes at 8pm.