Jeo, I'm 32 mate, and am competent in both metric and imperial. When I'm boiler-making or doing carpentry, it's predominantly metric.
When doing diesel fitting or servicing, it's imperial (Caterpillar gear mainly - which is US made). With the majority of firearms I've used, calibre is imperial, and ranging is done in yards. Same as archery - measured in fps and ranged in yards. The cross-over from bows and rifles to Nerf is probably why I use feet, rather than metres, though I have been known to use both. Brass is obviously imperial, and so is PETG, yet conduit is metric. It's all about being flexible I guess.
A lot of the guys I've learnt from are like Serv, and even though they saw the introduction of the metric system, the majority of them still use imperial, which is probably something that's rubbed off to a degree.
Like yourself though, I can't stand American spelling.
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