I used to walk my dog there on occasions. As others have said, it wasn’t a great location. It was high, and being so close to the coast, could often be in low cloud. (Ironically, Exeter Airport, nearby, has one of the best Met records in the UK, but it’s also near sea-level.). Haldon was also quite small, and the contours and roads nearby precluded expansion. There are a few other long-forgotten strips between Exeter & Plymouth, dating back to the pre-war RAS days, mostly now disused. Flying also used to take place on the nearby Haldon/Exeter Racecourse.