Romford is probably your best bet - just up the road. There's a couple of Thai places and I've heard good things on here for Romford Massage - External Link/Members Only
There's a Thai massage place on high road chadwell heath that offers extras aswell
Yes Siam is the place.There's another place 1.5 mile away by romford dog stadium that's even naughtier. There's a sex sauna by goodmayes station