Just before I bought my P38 it had a new water pump (allegedly a Britpart pump according to the spannerman who maintained the car before I got it) it failed again a few months ago, it had a metal impeller, the impeller itself was busily working its way through the pump body as the bearing obviously exhibited some play for some time. the replacement Bearmach also had a metal impeller. The (allegedly) Britpart pump lasted 25K miles. Some Britpart bits seem okay - others are utter, utter, utter ****e.