Custard you have covered well a point I was going to make about woodburners.
They seem like the logical choice but in reality they are far from suitable. They require a lot of manual control, take a long time to heat up and then usually overheat which just wastes fuel. You can't leave them going overnight very easily and temp control is very hit or miss.
Fuel costs are very cheap, or even free but often require time and effort to prepare. They are very costly to install and maintain. A good wood burner properly installed can cost a couple of thousand £s, a couple of oil filled rads would cost under £50 if you are canny and it would take many many years to spend 2 grand on electricity running them.
Wood burners have their place for certain, but workshops and infrequently used spaces are not one of them in my opinion.
I use an thermostatically controlled Inverter Paraffin heater in my shop, it works well and is cheaper than running a similar sized electric heater. It would not be so cost effective if had not got it very cheap from a friend and can often find cheap fuel to run it on. It it broke, I would replace it with electric.
If you use your shop often, good insulation plus oil filled rads is best. If you use your shop less often, fan heater or gas heater is good. If you stay in one place a lot, an IR heater will likely do you well.
If glue-ups are a problem in winter, consider bringing them into the house if possible.
