In message , Adrian writes
Enjoy, photos please or even better a video, you may make it on to one of the TV home video shows !!!!!!!!
I went to lift a cover, of some cable ducts, in a sloping car park a few weeks ago, as I took out one of the 4 bolts holding the cover down a nice fountain of water lifted it out for me! It was the lowest pit and had some 5' of head on it, no drain in the ducting system. Only water though, yours could be much more interesting :-)