Jon wrote:

Thanks for your replies. From what you are saying it appears unlikely
that there is anything to worry about.

The coving consisted of a card/pvc exterior, filled inside with
plaster. It was heavier than I expected it to be. I think it was called
Blue Hawk Cove.

Thanks,

Jon.

Sounds about right.

That stuff is generally regarded as better than the polystyrene version as
you could scrape paper off and re-paper - something that would be more
difficult with polystryrene with damaging it.

Polystyrene is cheap and easy to fit in contrast.

Cheers

Tim