Was planning to do this last year, but too busy with other jobs. Current WC with low level WC. boxing in for soil stack in corner. Going for a concealed cistern. Although it was functional wanted something more modern and a way to hide all the pipework. Upon closer inspection, there was a leak on the double bracnch socket on soil stack. Stripped all the boxing in. Adjusted the copper water pipes to go under the floor. Cold fill for toilet cistern is clipped to the batten. Boxing in underway with 9mm ply over. The plan was to supply the water and wast from the other side of wall in (bathroom) so it would supply both basins. Plan changed! Decided to go for slimline cabinets to go under the sink, may make up something as they are quite dear. So have run independent supply for this sink. I have soled a small stub and fitted a push fit stop end. Hot and cold water supply pipes have been routed up for connect to sink. Changes the plastic levers to match water temperatures.