London Waxing Recommendations?

I'm looking to get my bikini area waxed. I had it done once at the start of this year since I've begun pole dancing. I had planned to get an extended bikini, which my friends from the states explained to be bikini area + inside your bum crack and a trim of the remaining hair. But, where I went didn't do the bum. Their "extension" just included the happy trail. Is this a difference of US vs UK or was this place just different? Any recommendations of where in London to go for a great and affordable wax?