Went over to see dave_morrison and rummaged around in the inner most recesses of his washing machine... Where I found:
2 bra underwires
1 guitar plectrum
1 piece of gold (effect) chain
2 bits of unidentifiable bits of plastic
1 bit of a shoe
and some soggy fluff.
Once the above was fished out of the pipework and the pump, all worked fine. I was rewarded with pizza and coffee :-)
Most pleased I didn't have to order a new pump for him.