People’s height is generally ( always ) measured / quoted in feet and inches
Most forms I see have metric first these days, especially thd NHS ones I've filled in recently. All database data is in metric as it apparently makes calculation of anaesthetics, drug doses, etc far easier, more accurate and therefore safer (as it is less easy to make calculation errors)
Granted, but your speedo also hss metric numbers there as well. Even my 1970s Reliant Scimitar GTE had that 40 years ago!
Weight in stones and pounds in many cases
Nope. Again, forms tend to be metric first nowadays. I know my weight in kilograms, not stones and pounds, simply because I work in kilos. Again, the NHS convert your archaic measures to kilos for the reasons given above.
Even my missus has finally converted to kilos as differences in weight are easier to comprehend, so she tells me
Psi for pressure when pumping up tyres ect
So what you are saying is you don't use the second scale that every PCL tyre inflator has had for well over 30 years?
As to engine sizes, just exactly when did they last use cubic inches to describe engine size in the UK? The answer is a long time before 1960 (in fact they never did - prior to cc being used it was HP as in Austin A40 and before that RAC horsepower - a taxation value). I seem to recall that the quintessentially British BMC gave its' cars names like Austin 1100, Morris 1800, Mini Cooper 970S, 1071S then 1275S, and so on starting in the early 1960s.
My Lord, you'll be calling for the reintroduction of cubits and ells next. Just how ancient are you?