The Glasgow point reminds me of a rule in the Edinburgh MATS Pt2. Aircraft from the west/south west being vectored for r/w 24 are not to be given descent to below 4,000 ft till past the r/w 30 approach course. They're well into the 3,000 ft area of the RVA by then, but the rule is there to stop GPWS events based on rate of closure with terrain rather than proximity with terrain. The high ground there tops out at 1,900 ft.