Spekesoftly
Yes, sounds very likely. Interestingly, (well, not that interestingly)! Manchester are still required to take a 1000ft above the ceiling of the route, whilst Liverpool can, I believe, descend to 1800' QNH above it. Now you mention it I do recall that it was possible to receive a VFR clearance through WHI not above 1500ft whilst 'rule 21' Manchester was always SVFR at that time so it all adds up. You sound like a man with a lot of time in!! Ever work in the old 'lighthouse' TWR?
Spiney