How many swinger ladies would you expect to be there per party? Would they not stick together if there were pushy idiots about? 
Though from what you recount, it sounds like the ID requirement hasn't deterred the guys who won't take no for an answer anyway! 
Tyla generally only works weekdays, during the day- I'm guessing they know full well she's a main draw, and people will go out of their way to see her. She's usually there on a Saturday night, but doesn't work/play.
The last time I went there, the working girls were a fun but slightly chubby blonde polish girl, a woman called Demi who is getting on a bit, and a younger milf with short dark hair. When the night started they were all in the main room and there was no moving them. A lot of the older gents (who probably told their wives they were just at the pub) were quick off the mark to get in there, popped once and left. I actually spent the first half hour chilling in the sauna, as whilst I'm not prudish, I had no desire to share two pushed together beds with two women and 10 old men...
There were three swinging couples- one I didn't want to touch with a barge pole, and one very attractive one who ended up having her ass handed to her by my mate. The third one was attractive, but if I'm honest I shagged her without getting a proper idea of what she looked like- I came out the sauna and took an anti clockwise walk around the back area, then as I passed a play room there was one guy watching a woman get pounded and sucking two blinds off at once. He had a beer in his hand so I went and got one of mine, and just watch this woman get gangbanged. When one of the men finished, I asked politely if he was going to join in, and he replied "no, that's my wife, I'll fuck her when we get home. You go ahead"... So what was I to do!? It's a hard life so I took one of the condoms I'd got attached to my ankle using the elastic band off the locker key, and went at it without really knowing who I was fucking!
This was a Saturday night, so they were open until 1 or 2 am, and by half eleven a lot of the undesirable types had gone home. We then had a bit more fun with the girls.
The women don't tend to walk around alone, but I think it's better to know that they could do if they wanted to without worrying about anything.
As someone else said, kind of standing there trying to get them aware of you is the polite thing to do... But when a punter came up against one of the WG's from behind wearing a condom nobody had seen them remove from the packaging, they were not impressed. It's one of those things where this weird unacceptable behavior never crosses our minds as we are "normal" blokes, but you never know with done of these folks!