Have you tried Baan Chuenchai, Thai massage shop on the edge of Dunstable? If you can book with Jay, the owner, you'll have a good massage and possibly some extras (ask politely). Jay gets booked up quickly though. She has lots of regulars and of course she's running her businesses.
She has other ladies working in the shop. I don't know any of them, but there are some old reviews on here somewhere. You might find someone you like?