Just wondered if there is a standard for how many attendants you're allowed at a birth? Or does it vary from hospital to hospital?

With Alexzander I was told that it was 2 only and planned on having Aaron & mum. Although they were a bit more lenient and allowed my dad to be there for some of the time.

Next time I would like to have Aaron, a birth support person & a very close friend who has had her own VBAC. I know they should be fine with the first two, but would I be allowed to have the friend there? Would I get away with it if I say that I have 2 birth support people & Aaron?