There is no real website. I just get the feeling they have had more scrutiny than they want in the past so keep it low key. I think they are even reluctant to give out descriptions of girls or prices over the phone. Phone no is 01142720522 but all you will get is the number of girls on and maybe their names. What does work well is the way it's more relaxed than any other parlour I've been in. People tend to go in, spend a while looking around and then go with a girl - or not. If you walk in to GFE say the girls need to be brought out and you feel very conspicuous if you don't pick one. At paradise they just wander round, sit at the bar or whatever and if you see one you like go ask her if she does extras or just book her. I've seen a few times where a group of guys come in, 1 goes off with a girl and when he comes out the rest leave.
I dont think you can really beat this place for a basic punt.
It's not full on GFE but sometimes there's something wonderful about the simplicity of not planning ahead, not wondering if the pictures are accurate etc.