What could be the danger in this situation?. My elderly wife and I live in a Council bungalow, and we have had?

workmen in this morning to replace the loft insulation. The workmen cant do it because they have found an old water tank, covered in asbestos lagging. they have sealed the attic off until a specialist team can be brought in. We moved into this bungalow ten years ago, advise please!...