For me, the issue with having a stat in the living room is that when this room is occupied, the temp rises, cuts the stat and the rest of the flat will drop cold, so bedroom cold when they go to bed. Hence the normal recommendation is for a stat in the hallway to keep an overall ambient temp and use TRV's in occupied rooms to control the individual temps.I have had 2 quotes & been advised that the installation needs to ensure water continues to circulate for as long as boiler is above its safe internal temperature. This to be achieved by having 1 radiator (hall usually chosen) not having a TRV but to be always open & on.
Put a TRV, set low, on the hall rad, but not on the one in the living room; and install the thermostat in the living room.
If there is a TRV in the same room as the thermostat, the TRV must be set to max.
If we had non-TRV rad in living room means this room would always be heated when heating is on. Tenant would not have option of turning off the living room heating. But this room often only required to be heated in evenings. In day time it would usually be kitchen that heated. Tenants will not want to heat empty rooms. I am trying to find out if we can have all rads with TRVs with heat dumping provided by ABV and without the fixed thermostat and its associated non-TRV radiator. I would not want a TRV radiator in same room as thermostat as TRV could get turned off with stat calling for heat for hours.
To be honest I think you're trying too hard to out-guess your potential tenants. Keep it simple and they will figure it out for themselves. They will soon learn to adjust their usage when they get their first bill. Let's face it, a 1 bed flat isn't going to cost a lot whatever you install.