Henley-on-Thames is pretty much half way between Birmingham and Folkestone and an easy diversion from the M40. It is also a very nice place with an easy walk from the campsite to town, and on the bus route from Reading to High Wycombe. Two nights here planned, then a night at Folkestone, then the tunnel to France.
On the move again starting our first proper holiday this year. Some shopping, some family business, and a visit to the transport museum at Wythall where there are old buses and electric vehicles: