That keeps the travel reasonable and allows me a few days in each place.
All of the things you enjoy can be found there, and it's so small*, you can do all of them within a couple hours easy train travel. I usually have to decide before I go wether I'm going North (York, Newcastle, Edinburgh, Scottish Highlands and Islands) or South (London, Cambridge, Bath, the Cotswolds, Wales). That keeps the travel reasonable and allows me a few days in each place. Autumn weather is milder than you'll find back home, though, yanno, occasionally wet.