Haven't got a boat anymore but still like to check out the forum. While taking an old storage heater off the wall in the house I have just moved into.it occurred to me that the bricks in these Dimplex storage heaters would make ideal ballast weights - they are extremely heavy, about 10ins square and 2ins thick. Knowing what people charge for these 50kg steel weights I would say these bricks would be ideal, bearing in mind that these early heaters from about the 70s are quite expensive to run and a lot of councils/housing associations if there is gas nearby, they are converting to gas heating/other means of heating (eco friendly). Sorry I can't give the weight of these bricks as didn't have the means to weigh one. If you ask around you should be able to find someone who is scrapping these heaters.
Regarding our boat, which we really enjoyed and lived on for 3 years until ill health forced us to sell, but given the chance we will, sorry to say this dreaded word, knowing some on the forum don't like this word mentioned, but I'm afraid the wife and I will 'HIRE' a boat. There I've said it.