Party venues in London for adults only

[Basketofchocolate]

Not in a XXX dodgy adults way!

Just trying to get together a group of friends and want somewhere central to meet up where it's just us.

Somewhere fun or interesting or boring but with music would be good.

About 20-30 people.

All suggestions welcome

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What about that tapas place in soho think it's called Pix, they have lovely upstairs bit. Not sure about music though.