I reckon BSD in P'boro is about the nearest one I know about...I've never been there, so I don't even know where it is, but it's only 40 mins or so to Peterborough from Bedford. If you can book a slot it should be ride in ride out.
Also...seeing your post reminded me about the optimate....which I confess I'd forgotten about.
If you do take it to BSD but have to leave it there, I'll give you a lift there and back and there and back....might even see if we can tempt some of the locals out for a pint while we're there
