Last March, during the famous Beast from the East, (my planning as impeccable as ever). I dragged my family onto the Shroppi to 'do' the Pontcysylle Aqueduct. We hired a bargain boat known as the Barrel of Ale, hitherto known as the Crock of Shit by us.
Anyway the instruction was as well as a couple of turns on the permanently dripping stern gland was to run the bilge pump, no auto float switch fitted this resulted in pumping overboard a good few gallons of disgusting oily bilge-water. Unfortunately the only alternative to this was sinking and we were bloody cold enough as it was.
I notice the 'Crock' seems to have been retired, it was a solid 'Coal-craft' shell but well past its sell by date but sadly reflects the cavalier attitude to pollution that thankfully seems to have been superseded by a more responsible attitude to our environment.