We had a leak in our toilet upstairs and as a result artrex ceiling sagged. We called a plumber who stopped the leak but then when he pushed the ceiling a section collapsed and came down. He cleared the debris and removed the board and took it away leaving a hole behind. His colleague came after 2 days and put a new board in and plastered. I am embarrasses to admit I did not realise artrex ceiling could have asbestos. I called the plumber yesterday and this thought had not even occurred to him. I am now concerned. We cannot do anything now but has what has been too risky? The house was made mid 1970s?