What happens if, today, 4th December at 13:05:00 GMT, the UK specifically stops using coal is that it switches from exporting 802 MW to France to importing 1290 MW from France.
Right now, even though we’re pretty close to the Winter solstice, the UK is producing about 1.5 times more electricity from solar than from coal.
Yes, there are other fossil fuels besides coal in the UK, and yes renewables only supply about a third of the UK’s electricity right now, but coal itself is practically dead.