I am located in the Crewe area the motor factors are based in Nantwich, The name is J-Sect Tel No 0127062717.
I did give them a call to check availability and price, I have miss priced them in my previous post they are quoting £67+vat exchange they do have a set in not sure though if they will fit your B, they also say that they can refurbish your old ones should no exchange be available.
I have used these people for all my repairs on the B and I find them very helpful, but I'm sure you must have someone more local to yourself who can offer a similar service.
Hope this helps.