Brexit

[DrPatrickBarry]

That would be a combination of trusted trader, self declaration, mutual recognition, random and intelligence led checks away from the border.

So why not remove it, in say 3 years, as the Malthouse option now set out? View it as a warranty rather than an insurance.

I would guess the issue is that all of that stuff is underpinned by european law. So that countries and/or companies can get their knucles rapped if they break the rules.
But with the UK leaving the jurisdiction of the European Court of Justice, the EU would have to "trust" the UK, as they would have no way of actually verifying if products are what the UK says they are or do anything about it if they are not.
Remember the cases such as the UK winning in the ECJ, becasue France was using BSE as an excuse to block UK beef imports.

https://www.theguardian.com/uk/2001/dec/13/bse