From what i understand alot of the thermoplastic floor tiles laid in houses on the ground floor back in the fifties & sixties contained asbestos as well as textured ceilings artex etc. even the humble ironing board cover. As a previous poster has mentioned it was used in so many products, storage heaters also contained some. I would be interested to know if we are all going to have to start carry out an asbestos risk assesment everytime we carry out work in older dwellings to verify it is not present even a ceiling that has been reskimmed could release the fibres when cutting holes for downlights etc.