Building materials: feet and inches. 4'x8' sheets of plywood, OSB, etc., not 1220 mm × 2440 mm.
They're 1200 x 2400.
And "four by two" is easier to say than 100x50.
And TVs, monitors, phones are in inches, though I bet fewer than one person in 10 knows what is actually measured, they only know bigger is better.
Beverages: pints, quarts and gallons live side by side with liters.
Distances: miles.
Temperature: Fahrenheit.
We switched from UK units to SI in the early 70s when I was around 10 years old. I'm decently familiar with both.
You'll hear older people (older than me!) refer to miles sometimes still. I don't actually know what a teenager now would make of that.
It's many decades since I've heard of any liquid measure referred to in UK units except maybe a pint in the pub, but that's usually called a "handle". And 44 gal drums, which is more of a name than a measure.
Even my parents and grandparents dropped the illogical Fahrenheit basically instantly. I haven't heard it from anyone except USAians in maybe 50 years. Not even in cooking ... I guarantee when my 87 year old mother puts something in the oven she thinks "180 for 45 minutes" not "350".
NZers have for a century prided themselves on being able to fix anything with a bit of number eight fencing wire, and I think everyone can still recognise that on sight, even through new fences switched to high tensile 12 1/2 half a century ago. I don't know whether farmers now refer to it as 2.5mm. Solar panel cable is for sure 4mm or 6mm (cross section not diameter).