A 35ft boat can cost £7K (30 plus years old) but need the same spent on a new bottom within a year or two. Boat goes into dry dock for blacking, they blast the old blacking and rust off, and little holes appear, or sometimes only obvious when the boat is popped back in the water. Mind you my son bought one for £8k (36ft) which needed substantial refit, but the hull was made of unbelievably thick steel and was made in 1979. Good for another 30 years. As the comment of "COLD in the winter", if you've got a solid fuel stove you're usually opening windows to cool down. Keep on hunting.