Canada Plus, Indeed

A Canadian-style deal, you say? It was not until 1982, 115 years into Dominion status, that the Canadian Constitution could be amended without an Act of the British Parliament.

Or an Australian-style deal? It was not until 1986, 85 years after Federation, that the Parliament of the United Kingdom gave up its power to legislate at State level in Australia, that the British Government gave up its right to be consulted on senior State level appointments in Australia, and that it ceased to be possible to appeal to the Judicial Committee of the Privy Council from the High Court of Australia in theory, or from the High Courts of the States with surprising frequency.

Likewise, it was not until 1986 that the Parliament of the United Kingdom lost its power to legislate for New Zealand. The Judicial Committee of the Privy Council remains the final court of appeal, not only for the British Overseas Territories and for the Crown Dependencies, but also for seven Commonwealth Realms, for the two states in free association with New Zealand, for three Commonwealth Republics, and even for Brunei, which has its own monarch.

And so on. The EU would not mind something like this at all. And Boris Johnson is certainly not going to stop the EU from having it. To this day, Australia has never formally declared independence, nor has Britain ever formally granted it. Think on.