Room thermostat in the hall. What to check for maximum efficiency.

A lot of us still have fixed wall stats in the hall. Here is a video on what can go wrong and how to gain more efficiency and save on your heating bill. If your hall rad is last on circuit then it may be a bypass rad in that case do not fit a thermostatic valve on it.
Saved money on plumbers coming out? Want to donate a £1.00 and keep our spirits up? Here is the link. www.dereton33.c...
Many thanks Al and Jan.