Please dont go putting oil with petrol mixed in it on your gas stove

Oil that is semi solid is just not suitable in the uk at most times of the year. Even when converted to biodiesel it is not much better!
The cloud point can be as low as 7C.
Believe me, it doesnt take many mornings of jacking up your car and lying under your car with a hair dryer and as many fan heaters as you can find heating the fuel lines, tank and diesel pump for 2 hours until you stop using it.

Believe me ive been there.

Find some proper liquid oil from a restaurant, a responsible restaurant should not be using hydrogenated oils anyway it is just too dangerous for health.
Phil