Rural scene have some.
Then it’s finding the right agents in the areas of interest. Eg down here (Cornwall, Devon, Somerset) it’s the likes of Phillip Dunn, Kivells and Nancekivell, with Webbers having the odd one and Stags being only if you’re made of money
Get local papers and use the internet, and work out which agents get the right sort of properties. Then strike up a relationship with the most likely ones and stay in touch, so they think of you first and call you before things get advertised more widely