Just a quickie :-)
In my bathroom, the 40mm waste pipe from the bath (enclosed on the floor against a wall) passes the wash basin. The wash basin has it's own 32mm waste pipe and both pipes run (inside the bathroom - no option) together to the point of exit to the soil pipe outside. Would there be anything to stop me simply joining the basin waste to the bath waste pipe by means of a Tee and thus having only one waste pipe for the remaining run to the exit?
TIA.