Tory Brexiteers have called on Boris Johnson to scrap part of his deal with Brussels - despite voting for it. The European Research Group (ERG) said a key plank of the Brexit agreement - known as the Northern Ireland Protocol - should be ditched as it had "profound and negative effect".
The protocol was drawn up to avoid a hard border on the island of Ireland by keeping Northern Ireland in the EU's customs union for goods.
However the plan has caused disruption at Irish Sea ports due to the need for checks on goods travelling between Great Britain and Northern Ireland.
Those difficulties are expected to ramp up after April 1 when a grace period on red tape applied to imported supermarket goods ends.
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