Bosch Classixx Condenser Dryer WTL6003GB Pump

I have the above model (described as infamous on another section of this forum(!) – in view of interior access difficulties – I can go along with that!). Anyway it stopped pumping out the condensed water, flooding the sump and eventually fan housing.
Traced to the pump where a little plastic clip at the end of the motor shaft had dropped off, releasing an o-ring which then jammed in the impeller. I managed to reassemble and everything worked OK for a while but now it’s stopped pumping again, so I assume the pump is u/s again and obviously needs a new one.
A source cheaper than Bosch appreciated. I believe this is a badged White Knight, so perhaps an alternative route?
TIA,
Albacore