100% compliant looks like a good idea to not change anything.You don't understand English. 'Best available terms' means the best available terms agreed between the UK and the EU. If the EU are too stubborn about their red lines, then 'best available terms' could mean anything - including down to the worst case of 'no deal'.
There's no sensible reason for a 'no deal' though. The EU ought to be able to offer us a trade deal at least as good as the one they've done with Canada, given that the UK is nearer, does a lot more trade with them, and starts out 100% compliant with current EU regulations.
The youth voted remain because they are on average closed out of raising a family in a house they nominally call their own. They feel a belonging in Europe with a renting paradigm.
I see a parade of these 20 somethings just through New Zealand.
LOOK WHAT YOU HAVE DONE!