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[Matchless]

Nothing wrong with imperial measurements providing that you were brought up with them. I quite like the idea of the FFF system of units, that is the Furlong, Furkin and Fortnight.

We have a machine at the GCRN that has a metric engine, metric axles, imperial (UNF) gearbox and imperial (Whitworth / BSF) chassis fittings. This is OK once you know which bit you are working on and get the right tools but last week I found brake hydraulic fittings with UNF threads but metric hex sizes - presumably because they had metric hex bar in stock the week it was made.

[Bigron]

WAY off topic, "Matchless", but does your avatar relate to a bike you once had/still have? Aaah, memories.....

Ron.

[Marks DTM Calib]

I started working in Imperial, moved to Metric then started working for American companies who sent me all Imperial again.

I was working on a machine from Illinois last night with both Imperial & Metric fixings 

Try a Fuel injected Rover V8 from the 80's (pre Thor), they have UNF/UNC fixings for large parts of the main castings, Whitworth on ignition systems plus some ancillaries and metric on the Bosch sourced injection setup!

[Lizzie Zoom]

It was a chuffing mess, I guess anybody under about 45-50 would be mostly metric (In know I am!)

I'm (just ) over that age and I am fully converted.  Metric is much easier