never had anything to do with the liners but i'd think if they've been pushed up then your almost certain to have a leak as to be fair it doesn't take much on Rover's to cause a leak or head gasket failure.

Can't you push them back down and fill up water jacket with water and see if it holds water.

I know its not under any pressure but i'd think they'd leak anyway.

I've took them out of a scrap engine but can't remember how the seal.