We British are supposed to value our freedom. So please let us retain freedom to choose how best to serve ourselves, without becoming criminals.
One of the easiest ways to unwittingly become a criminal in Britain today is to use Imperial Measures, because we are most familiar with them, instead of Metric Measures, as required by European legislation.
Obviously, this mostly applies to traders, but to criminalise the use of measures is trivial. to say the least.
My suggestion is that HMG removes the enforcement of Metric Measures, and the consequent criminalisation of offences, and allows the use of dual (Imperial and Metric) measures, as deemed suitable by the trader to the customers he is trying to serve.