I've tried them twice the last time I was in London and didn't receive a response to either inquiry.

I used them a few times in London. Both were the girls advertised. It's almost cheaper sometimes over there. Strange. So much good talent in the uk. If your heading over there are better agencies. In my opinion.  

I tried Angelica Heart through them when I was there in September.
They responded asap.
I also wrote a review about her in the greek forum that I participate,but I don't know if links to other forums are allowed here.