I reckon your aux heater will be ok Guy, it should push up to 60degs? regardless of outside temp. The other thing you can do is make a small fire in a can and place it under your sump!!
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1996 A8 4.2 QS. Bose, Solar roof, um...um... rally sport towbar. Now gone to a new home as the Traders 8.
Bright yellow bus o love.
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