My thermostat is in the sitting room and I have an open fire, so as soon as the room is nicely warm and cozy, the central heating goes off and the rest of the house is cold. I have heard about WiFi thermostats. Might this be the answer and would it mean taking out the original thermostat? I rent the house.
You've got a few options:
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WiFi thermostats allow you to control them remotely (they connect to your LAN via WiFi); they are not wirelessly connected to the furnace.
Another option is upgrading to a thermostat that supports multiple temperature probes. You would leave the thermostat where it is but add a remote probe in another location. The thermostat will take an average which should improve the situation. This might be a bit easier to install since you only have to run a wire for the new probe versus running a new wire all the way back to your furnace.