Pump to a head

I am looking for some pumps which will circulate my systems. One system is
about 200 gallons and the other system is about 120 gallons. The head for
both systems is approximately 7' 8". The pumps need to be low wattage (using
a hippo at the moment at 300w ph, ouch) and able to run these systems at a
reasonable rate. Any ideas what I ant and where in the UK I can find them?

Cheers

Mark