30-06-2021, 08:51 AM
Having done the VSCC Measham Rally in my RL saloon on a frosty February night some years ago, I would say that a heater is not necessary. If anything, the interior of the car got too warm. The entire bulkhead of the car gets pleasantly warm and if you eliminate draughts around the pedals, gearbox and doors that is sufficient to keep you comfortable.