Now that we’ve trimmed back the tomatoes in the polytunnel (still producing but air movement is vital as the weather gets colder) I’ve been able to roll the side window (blind?) down on the polytunnel. That will help keep the heat in. In theory this could regularly be rolled up and down to cope with temperature but the foliage of the tomatoes has made that hard.

Next year, I probably need to allow a bit more space at the back of the beds to reduce the issue and then I can more actively manage temperature during the autumn.