No, you can't "opt out"
. Personally I think it's money very well spent. It funds the BBC TV channels (BBC1, BBC2, BBC3, BBC4, BBC News Channel, BBC Parliament, plus there are kids channels and things too), innumerable BBC radio stations, and all the BBC web sites. It's what permits the BBC to fund drama and educational programmes that just wouldn't be commercially viable for a broadcaster who has to make a profit.