Hi there Got a house with Marley tiles downstairs which has been stuck down with bitumen. That's all very level and apart from the odd tile that's come off due to carpet grippers seems to be very sound. My problem is there used to be a fire place which has been covered with some rubbery tile, I think asbestos vinyl, and these tiles are about 5mm lower in places, then the Marley tiles, there are also a few high spots where they are about 10mm higher. Would I be able to remove the vinyl tile and grind the concrete flat to even it up, then use 5mm fibreboard as underlay then lvt. Or do I need to remove all the chimney tiles, remove the high spots self level it then 5mm fibreboard? Thanks.