Thank you guys for your comments.
It's interesting the Washington does already have a history of noise problems. Was that instance the Night Club or the Wine Bar, cambrian?
There's no sound-proofing for the wine bar - the main doors are wide open, except in extreme weather, leaving just a flimsy swing door. The smoking area is wide open so the rowdyness is heard by all around. If it ceased at midnight it would perhaps be bearable, but it continues on until 2:30 or so, which is intolerable in a residential area.
The noise from the Night Club is even worse if you happen to be on the Prom, but fortunately does not affect us. I'm amazed the B&B's and hotels on the front put up with it though - I'd certainly not stay in any of them with that noise going on and on!
I'll get back in touch with the CCBC next week, mentioning the licencing side of things and see what happens. After that, maybe a councillor could help, it is another approach, although again a few more complainants would help.