The entire “Trumptonshire” Trilogy had their original film negatives re-scanned and restored in HD in 2011 but only “Camberwick Green” got a Blu Ray release in 2011. “Trumpton” and “Chigley” never got released in HD and “Camberwick Green” BD sells for quite a high price these days.
I never saw much of these shows but they’re considered classics and ought to be preserved and available in the best possible way.