Some people have suggested blocking off the radiator as a way to hasten engine heat. My own experience is that as long as your cooling system is in good order this will not help. The thermostat will not open until the engine has reached operating...
Common misconception.
Unless you can find some sort of switched multiphase setup (Suzuki used it in the eighties but I am sure Landrover never caught on) then your alternator is drawing power all the time it is spinning. Turning on electrical...
Something to check before starting work on a heater.
I have had my 110 200tdi for 23 years and the heater was okay once she warmed up. Then she stopped getting warm in the winter. People told me that they always run cold but I knew this was not...