OK, I do not know where you are, I am in Watford area but found the older type (it seems that they do not make type C anymore) MCB 6A type C in Gateshead branch of CEF, 01914824222.
In the Watford area I found the 10A type C old model, if you are interested call JOLEC on 01923243656.
Good luck
In the Watford area I found the 10A type C old model, if you are interested call JOLEC on 01923243656.
Good luck