Our kitchen worktops must be quite old as they were in the flat when we moved in 15 years ago. As we need to replace our sink, built in oven and hob it seems a good time to put in better ones.The present worktops are 38mm thick and the walls were evidently tiled afterwards right down to the worktops. New worktops seem to be sold as 40mm thick. My question is would a fitter be able to remove the old ones without damaging the tiles and does the extra 2mm thickness make any difference. Bill.