This is the High Street in Great Missenden which is famous for the pricey Roald Dahl museum. As locals we can go in for free one day a year and it is not worth paying for. The 2 items which are really interesting, his writing chair and room take about 2 minutes to see and if I had to pay I would be really disappointed as entry is not cheap !
Instead look up the 2 town trails, one is in town and takes you to sites which feature in Dahl's books, e.g.) the petrol pumps in Danny the Champion of the World. The other takes you for a good tramp around the countryside to see other places featured in the books.
There are also free tennis coats and a skateboarding pipe here as well as a good play park and a football field. There is good train access and you can park for free for the first hour or so !