TRV'ing everything and ruinning the whole sytem on a time clock is far
more energy efficient than having a master thermostat and no TRV's

Both of these systems would not be not permitted. You may have a master room
thermostat and TRVs, or all TRVs and a flow switch to detect the TRVs are
all closed. You may not use all TRVs and then pump hot water through the
bypass all afternoon.

Christian.