For those wanting to plan an itinerary to not-so-popular destinations (and some that do draw lots of tourists), here's a reminder that you can subscribe to free emails from Discover Britain that give illustrated summaries of a range of "Great British Days Out" every month or so.
Note I am not affiliated with Discover Britain. I simply enjoy being an armchair tourist reading their ideas, imagining that one day I'd like to have the resources to visit many of the places described.