It happens to us all sometimes, so I'm not having a go, at all. But just to mention, in case anyone reading this thread is not aware, that it is a requirement under animal welfare codes of practise, that all sheep in the UK have their fleeces removed each summer.
In your situation, Jon, I too would leave them now for the winter. But I'd want them shorn as soon as the weather warms up next year, or be worried about strike, overheating, getting stuck on their backs, and so on.
And would check them several times a day when they're heavily pregnant in case of getting stuck on their backs.
If you think on balance that it would be better to shear them, you can get them clipped with a winter cut, which leaves about an inch of fleece to give them a start on their winter coat. And then feed them to be sure they have the sustenance they need to keep warm, grow more winter coat, and at the same time come a-tupping and get pregnant.