just moved in victorian terrace house where kitchen floor at the back of the house was covered with lino. When we removed lino we discovered quarry tiles covered in some places with what looks like levelling compound. The floor is considerably uneven and damp! I know that we have to put down some damp-proofing before considering new flooring but can someone tell me what to do? membrane or liquid damp-proofing?on top of existing tiles or should we remove the tiles first! thanks for any advice.