As a general rule less of the girls at pica partake in snogging which is why I always say don't expect it BUT if you play your cards right, are clean and able to get good rapport there are plenty who will.
I'm not arsed about snogging in a punt all the time, especially at £35 , it isn't a huge deal for me. If I go to a more expensive parlour I am more fussed about the services offered. Mikaela who used to work at pica has a look similar look to Bianca, she offered me snogging but I think this is at discretion rather than everyone gets it... Not sure when she's back though.