Speaking to someone European today reminded me that the rest of Europe are fully metric and have no idea what feet/inches are. It's just the UK hanging onto a ridiculous mix of imperial/metric measurements that makes absolutely no sense.
Would cause meltdown and chaos the change from pint glasses to litres.
On a serious not strengthens our relationship with big brother USA by being backwards and helps trade.
Admittedly SI units are easier for mental arithmetic but nobody does that these days.
No difference to Belgium speaking 3 languages by default.