Hi I am a complete novice when it comes to tiling so I'd appreciate the forums advice on a project I am currently undertaking. I am in the process of renovating a property that has a run of Victorian tiles in the hallway. They have fallen into a state of disrepair , the lines have gone out due to the settling of the floor over the years and towards the back of the hallway, tiles have been taken up some time in the past leaving bare concrete under the carpet. I am looking to replace these tiles with Original Style tiles throughout the entire hallway but would like to know if my tiler should simply lay the new tiles over the existing, or take them up? Some of the tiles are already loose enough to pick off the floor by hand but the others are fixed pretty well. Would best practice be to leave these in-situ and not bond the new base to them, thus protecting them or take them up all up and level the entire hallway floor again ? Laying over them would create significant additional height to the door threshold so I'd appreciate thoughts on how this could be mitigated, too. Finally, has the forum had experience with Original Style or Mosaics by Post , the latter seem to offer a similar tile pre-set on some kind of adhesive backing, which would appear to be easier to lay. Or are there any other viable Victorian tile suppliers as the cost per sq/m for OS tiles is eye watering and will take significant time and money to lay professionally. Any comments, advice or guidance on best practice would be gratefully received to prevent a very costly disaster from happening. Images of the hallway are attached or on my profile.