Used the Flybe lounge at Gatwick last Saturday even though I wasn’t entitled to, explained that we had just returned from the Gulf and the lady gave me the combination to the door and then take our chances when in there. Got in and the lounge was empty and to be honest, one of the worst lounges I’ve been in, a few beers, some crisps and shortbread, didn’t stay in there too long. Last year flew to Kuwait with BA, got the use of the BA lounge at Aberdeen as it was part of our ticket, when at Heathrow tried to blag our way into the lounge, no joy, even after flashing our ID. Then a few months later, again flying out of Aberdeen, tried again to use the lounge and we were refused entry.
So generally, I would say no, but it depends on the size of your group and the mood of the person you are chatting to.