[From Simon's Comment]
I've booked a couple of evening dives with Sussex Scuba (where I get my fills from) :
1) Friday 29/7
2) Tuesday 19/8.
They're on Brighton Diver II at 17:30. The people in the shop are a friendly bunch, but I have never dived with them before. There are a few spaces left though if you check out their web-site:-