when I was having lunch or dinner at the Grapes in Stow on the Wold or the Horse and Groom in Upper Oddington on the way to the Rollrights and Chipping Norton (not to be confused with Chipping Campden which is entirely the other direction), my two go-to places before covid, and to be honest a couple of decades ago, we always needed reservations for indoor dining.
20 years on I would have thought that reservations - or a degree of patience and arriving early - were pretty much needed, even if just a telephone call in the morning or night before.
By the way, it has been some time since I have been to either, and certainly not after covid, so I can't vouch for either - both of which I believe have changed hands. Just an example of how do things in the area. (I've moved away).