I dug into my dusty bag and unearthed a set of Pilot's Notes for Cessna 150 issued by the British Light Aviation Centre sometime in the 1960's, I guess, (as well as Airtours' Notes for C172 and Cambridge Aero Club's for C150F). Was BLAC the same organisation as ABAC, under another name?
There was also a little circular plastic gadget sold by Airtours for setting up a pilot interpreted (rather than controller interpreted) instrument approach using a series of QDMs (every 2 minutes or less), which was part of the IMC Rating syllabus. I forget its Q Code; QGH was the controller interpreted version IIRC. That triggered a flood of memories of painful hours under the hood mastering this (for me) devilishly difficult procedure!