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The Convention isn't quite a customs union but removes customs on the components that go into a product that are sourced from the other countries signed up to it.

Sir Keir has ruled out rejoining the EU customs union and the single market, declaring it a "red line".

The government has also pledged the UK will not rejoin the customs union - an agreement between EU countries not to charge taxes called tariffs on things coming from outside the bloc.

On that day, Great Britain severed the political ties it had held for 47 years, but stayed inside the EU single market and customs union for a further 11 months to keep trade flowing.

On the Pan-Euro-Mediterranean Convention he said it did not cross red lines because "it is not a customs union".