Danny,
I am not that well travelled, but I am very aware that here in this southern colony that 'went metric' in a very vindictive anti-British way, still uses BSP plumbing bits.
I also have a pet hate for thing that are 'metrified', they are things that are manufactures/built to imperial sizes/standards but are expressed in metric units.
Fitted carpeting that is made on Imperial machines, comes in 6', 9' and 12' widths and is priced by the square metre is a prime example.
A double bed is 4'6" wide and a King Size is 6'! But they are expressed in metric units.
My local h/w shop sells timber that is cut to 183cm lengths! The daft staff don't realise that they mean 6'.
I'll calm down now and have a cup of Ceylon tea. I like the fact they don't call it Sri Lankan tea.