I am going to get a new boiler fixed. The heating engineer said I needed to get the asbestos removed from the airing cupboard. I went on rated people, and got a man who came round the next day to do it. My engineer asked me if he was certified, saying that usually they do a test and get back to me. the man did it straight away.I am now worried that he didn't do it properly and that there may be asbestos dust in the house.What can I do to check?