Pete C wrote in message . ..

Might be possible to install a pressure relief valve to bleed off
excess pressure back to the piping before the pump.

cheers,
Pete

Thanks for that. Anyway, back to the original question .... surely
someone in the wide world that is uk.d-i-y must have a "Wickes Twin
Impeller, Product No. 414-805. 2A, 300W Max". ... pleaase???