Thanks, Mr Min. I'm pretty convinced the overdrive is a good idea. I wish this sort of thing had been available when we had our Series back in the 1980s. It was hard to break the 20 mpg barrier but with lower revs at cruising speed we might have made it into something approaching an economical vehicle. Engines were a lot thirstier in the old days. Even the Morris Oxford we had, with its 1622 cc engine, struggled to get past about 24 mpg. We often threatened my mother, whose car it was, with putting a Rover V8 in. This would have been lighter than the BMC B series pre-rusted iron ingot, and probably more economical.Been a good read this and if I still had the series I would have been tempted to fit an overdrive. The 110 has a five speed box though (not showing off really!) so one less thing to worry about!
Seeing as it is hard to take pictures of things working properly, here's a picture of yesterday's test run instead:

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