....or is this a must and governed by UEFA? If it is a UEFA directive, then surely the FA can choose to dump it now we are no longer part of the European Union.

I'm not and never have been a fan of VAR as it is open to massive debate and, even some muppet sat in a warm office somewhere is still getting it wrong. Have you seen the Blades denial of a clear cut penalty last Saturday? Prime example.

I would rather leave it to the man in the middle, and yes they are only human so we've accepted mistakes for many many years now. The only electronic aid I would like to see, is 'Hawkeye' being used to show a ball has fully crossed the line.