It sounds like everything is cast in stone.
That's a shame, but it is what it is. Please drive very carefully and if (when) you feel drowsy stop in a layby or pub carpark. I so clearly remember sleeping in a pub carpark somewhere off the A40 after a flight to Heathrow from New York. Luckily my wife and father enjoyed their meal but they weren't driving.
Where do you mean for "Cotswolds"? It is a really large area in parts of 4 counties, all the way practically from Stratford-upon-Avon in the north to Bath in the south; nearly from the Severn (or at least Cheltenham) in the west to nearly Oxford in the east. For example, I grew up near Cheltenham and know the northern Cotswolds like the back of my hand but I get lost in the south.
Somebody spooked of driving here doesn't need to be trying to drive in Oxford. The City Council really doesn't like cars (I could be more vociferous but I'll restrain myself - I had a business in a suburb and speak from years of experience) (roads which end when you think they will go straight through or take you in circles, or suddenly are one way against you and very low speed limits and extraordinarily high parking charges (if you can find a space), and then there are the bicycles and now the electric scooters!) so I'd limit myself to getting a car at the station and driving towards Botley and then onto the ring road (A34) to the A40, A44 or whatever you need to get wherever you are going.
But then you don't want to use public transport to get to your car. Heathrow then. Good luck. Bath Road to M4 spur to M4 to wherever you are going. Lots of roadworks on the M4 west of the M25.
Please say where you will be going to so I don't point you in the wrong direction.
I'm sorry you chose the Cotswolds in November. Usually competes with February for the bleakest weather, although the days are shorter in November. Early November (bonfire night?) or late?
As I read this back I sound like a real grumpy gus. No not really, I'm just sad for you in the part of the country I love the most. I wish you had checked in here before you booked everything....