For those people going to Homebase anyway for the various end of line bargains and general rubbish you don't need but can'y help but buy...
The Craftright pump simply attaches to a drill and can transfer a variety of liquids including fresh and salt water, solvents, oils or fertilizers.
I've bought one to try and use with my hotukdeals water butt and hotukdeals hose at the other end of the garden in the summer. Worth a go at £4 any way.
In store only... try your luck with their stock system!