I hate being wrapped up when camping, so we take an oil radiator 1kw heats a five man tent lovely (safe to leave on all the time). I take a double outwell campbed and just a 5cm sim and I put an electric blanket on the bed to warm it up and then unplug for the night. The campbed has the advantage of loads of space underneath for tubs of clothes etc.,
We are always warm as the heat is consistent, and the condensation minimal.
If you dont want to take an elec blanket, then a couple of hot water bottle do the same job but not as toasty. We also put a duvet INSIDE our sleep bag if its really really cold.
A day of all things motorhome and campervan. The show is held both in the main indoor arena and across the grounds. Catering, hot drinks and food options are available. Easy access to the site and free parking included. Win one of five pairs of day tickets