very common problem once 6 yrs+.

there is one main supplier of reman' pumps, they advertise on ebay as well, think its £270 exchange plus fitting.

no cheep fix.

it might be ok for a while eg switch it off and will be ok next time, but will come back more and more frequently.

Mini were doing good will replacements to cars with fsh and under 3 or 5 yrs (depending on TLC pack) but they wont help on older cars even with FSH from mini.