Not very seasonal, but I finally got round to making a map of UK train stations + walkable campsites. Shows campsites that are <3km from stations (i.e. basically next door), and 10-20km away (i.e. very roughly a day's walk). Useful? https://felt.com/map/Rail-Hike-Camp-kv9BQ3TnpTvud8TM43gTqpB
Caveat 1: distances are as the crow flies, so do check whether you have to e.g. wade across the Solent. Caveat 2: data is from #OSM, so I have no idea of the quality of these campsites, or indeed whether they even exist (but URLs are provided where they were on OSM)
And if nothing else, you can turn off the campsite layers, and just enjoy a nice map of the trains #trains
Kim, you are very bad!