GreatAlbatross

So far, I’m only £150 down on cable and clips on my rennovation. And this is the decent stuff, AWG23, and double run.

It’ll probably go sideways when I spec up a switch with enough ports, mind…

imperial measurements have been legally defined in reference to SI units for decades

This is the important bit.
Effectively, we are metric, but display things using the old units sometimes.

And you sometimes get people ordering lumber for the first time giving bad reviews because they feel they’ve been cheated out of some wood.

I just assume I’ll do 45.45 MPG, then I’m pleasantly surprised when the fuel bill is lower than expected.

I end up doing a lot of lazy maths, and remembering rough numbers.

45MPG? That’s about 10 miles per litre.
8 inches? Eh, 20cm.

Anything remotely technical, I convert everything to metric (and actually take the time do accurately).
Having the inch-fractions to mm table on the back of a ruler is very useful when using old drill bits and spanners.