[hollowcelery]

As another commenter mentioned, your description of type #2 clubs in London misses the mark completely, and I suspect you aren't actually aware that type #2 clubs as described actually exist (which is fine - many people outside the scene won't know about them).

A hen or stag party would not be allowed in. The few tourists who are there are generally there becaus they know the scene and came specifically for the night. These aren't venues that you'd stumble into on a drunken night out. They're often holes in the wall in quiet-ish streets in Tottenham or Hackney or Elephant & Castle, and you generally have to buy a ticket for 15-25GBP in advance.