just do what i did, tell them whislt you was working some one form the council came up to you and told you due to health and safety you couldnt use the ladders any more and if they catch you again and there was a alternative system, plus if they feel you was in breach of h and s both you and the customer will be done, u for not working safely and them for not providing a safe working enviroment, if they say thats stupid, just point out the smoking ban, where if some one is working in your house it them becomes there work place and they cant smoke, trust me it works, as people dont want to be sued