I've just ordered - on the web - a 4 foot tubular heater from Toolstation. Toolstation send all orders over £10 free delivery.
Until that arrives - and they are very good value for money - I've put our little convector-heater into the water filtration shed. The temperature is dropping rapidly and some more of the white stuff is falling as the light fades.
For those who have not come across them, these 55mm diameter tubes come with fix-on feet with screwholes for stabilising into walls or on the floor and are available in various lengths from one foot long in foot-length increases up to four foot. They take a little while to gather heat but are great for maintaining a low-level warmth at a cheap rate and you can get wire mesh guards for them as well.
Great for kennels or poultry sheds - or keeping tool sheds aired out and not gathering condensation.
Just a thought to pass on in the present conditions. Let's hope there's not a run on them before mine arrives - AND that it will arrive before the snow clears.