... What is your advise on keeping warm? I was planning on fitting a wood burner.
Caravans often aren't well insulated and condensation is usually a problem. A wood burner is great for warmth and ventilation but it will consume large amounts of wood which you will need to source, possibly cut, and store somewhere dry. It's quite an undertaking. If a small fire (say 3kW) is in half of the day, think in terms of half a tonne or so over one winter. An awning is good, it makes a big improvement in habitability on a small caravan especially if it's floored in some way and it's somewhere handy for the wood pile.
Safety issues loom larger in caravans than many places. You should seek professional advice on fitting a wood-burner, it it's no longer permitted for a householder to install his own wood burner (unless he's a qualified fitter) but I don't know about caravans. It could be dangerous. It should probably be illegal although I used one for five years or more when I was building a house in Oxfordshire about thirty-five years ago. I set fire to the washing once and the chimney exploded once but apart from that I got away with it. Looking back, it was a death trap. Then of course the local clean air regulations might have a bearing, you might have to get a burner with particular characteristics or it might just not be allowed to burn wood for heating. In my area in Derbyshire it has to be an approved burner.
An electric blanket makes a world of difference but you might not have an electricity supply and the caravan might not be wired for mains electricity.
Hot water bottles are a very cheap and in my opinion much overlooked form of warmth. They need to be replaced fairly frequently, say every couple of years, as they perish and leak. Never use one if you have an electric blanket!
With something like a sleeping 'pod', a Jerven bag or some other similar whole-body insulation and a couple of hot water bottles you can be really cosy just sitting reading a book in any temperature you're likely to experience in SW England.
Hats and long johns are much underrated too.
I have recently laid my hands on a Tilley radiator...no idea if they are very safe though.
I'd be very nervous about using one in a caravan on safety grounds. It's inconvenient, it isn't especially cheap, and every gallon of fuel gives you a gallon of water which adds to the condensation problem. I recommend against it.
