Nine months after Scottlington brought a Cruftlabs bilge pump across the Atlantic I finally found a use for it. I just bilged out roughly 20 gallons of extremely grim water from the rain cistern in the back yard. This time I didn't fool around with trying to battery operate it, but instead wired it directly to the 240V via a DC adaptor I had kicking around and got a good flow going.
There's still probably 6 inches of sticky mud and detritus in the bottom, and I have to figure out what to use the cistern for. Current best bet is as a flower planter, but suggestions are welcome.