When we had the roof done at our last house the scaffolders secured a large eye bolt to the house the eye being big enough to slide a scaffold pole through. When they dismantled the scaffolding I asked the guy in charge if they would leave it as it was in a handy place to tie a ladder onto to get on the roof. He said they were expected to bring it back even the bit that went into the brickwork, he did however leave the latter in place and would tell his boss they could not get it out. The only problem was that nothing else fitted the fixture other than the eye hook they took away!

Richard