Thanks - I was hoping someone would come along and tell me they leave the pump in the rain barrel :-\. I have six rain barrels, each on a stand which makes them quite high to lift the pump in and out of without standing on a ladder. At my age with a gammy leg - not a good idea!
Currently, the garden is getting a good soaking every day or so from above, so the rain barrels are all overflowing. As summer progresses I'll see how it goes by leaving the pump in the barrel during dry periods till it is half empty - my garden is secure so I'm not worried about the pump getting stolen.
Tricia