Thanks; fascinating. You certainly know a lot on these topics.
Oh well, on that note, I went off to the garage to put the 'RT on the lift and adjust the valves.
I was amazed that only two of the valves needed any adjustment at all, the top right intake, and the top left exhaust; and even so, they were certainly within the range of the next up or down feeler gauge. I could have left them.
This could be an artifact of the way I adjusted them previously, with my old school feeler gauges, but couldn't have been much off. Now I have pairs of Wurth gauges in .15mm and .30mm.