What is the common rulebook?

There is no document that explains what a ‘common rulebook’ is, at least in the literal sense. Instead, the phrase is a short-hand for an agreed area of regulations in which the UK would choose to follow EU rules.

The precise content of that regulation would change over time, but would be defined more by its scope than its substance, allowing those involved to continue to adapt to changing circumstances.

Given its nature, the main question for British governments would be whether the EU would allow the UK any say about the formulation of those evolutions, or if it would just decide internally, leaving the UK a choice between following or abandoning the entire arrangement.

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