The UK should not have to pay “large” sums to the EU to trade with it after Brexit, Boris Johnson has said.

The idea of the UK paying for tariff-free access to the EU’s internal market has been mooted in recent days.

The foreign secretary told the BBC’s Andrew Marr that the question of whether the UK would pay anything at all was “pure speculation”, but if it did, any payments had to be “sensible”.

Critics say leaving the single market would be an “act of self-harm”.

Former Lib Dem leader Nick Clegg said remaining in the single market of 500 million customers was the “least economically disruptive form of Brexit”, and, in return for this, the UK should be granted powers for an “emergency brake” on migration from the EU.