I got it all sorted, i found a good replacement on ebay, and the chap got it to me the next day, so i have a spare pump body and a seperate spare motor so will have a look at getting the broken unit repaired when i have time.

a hint for anyone having trouble removing the pump, there is a little bit of flex in the tab that catches, if your careful you can bend it to the side with some needle nose pliers just enough to get the clearance.