Thanks Julian , but I wouldn’t want to mechanically fix orbry or Marmox boards to parquet floor with screws n washers as I feel this would dislodge and loosen the parquet pieces . ..Andy are you suggesting I remove parquet and fix the marmox boards down using jst a solid bed flexi adhesive ? With no need to mechanical fix ? Bringing back up to original height and then to tile onto . Regards , Steve