They are going on about the worst in thirty years. Well thirty years ago I was an Exmoor, one local farnmer, whose daughter I knew, had just had a barn built for winter lambing. this thisng was the ultimate, the MAFF as it then was hade confrences there to show it off. One Saturday, as now, the snow started. By Sunday morning where I was 1500 feet up Dunkery Beacon, it was twenty five feet deep. The roof of the barn fell in and the farmer lost three hundred ewes in lamb! So yes mate, might be a good idea to clear the roof.