So far all I've done is brought the suitcase in from the garage and started making a packing list. I did, however, phone the National Trust holiday homes people (the cottage is one of theirs) to clarify whether there was a proper cooker. The photos on their website only show one shot of the kitchen and that’s of the sink not the cooker. The list of things included mentions a microwave and fridge, but again no cooker.
The chap I spoke to assured me that hobs are standard in all their properties, which is what I had also assumed, but then had had a Moment of Doubt. But as usual, I was over-thinking it. So now I can plan the menu and decide what food to take with us.