Tory Brexiteers have told the Government that Northern Ireland must have the same Brexit freedoms as the rest of the UK as they push for shops in the province to be allowed to sell goods in pounds and ounces.
The Government announced in September that it is looking at allowing UK shops to sell fruit and vegetables in imperial measurements as part of a bonfire of EU red tape.
But the Brexit divorce deal reportedly means that Northern Ireland will have to stick to the metric system of grams and kilograms.
Talks between Britain and Brussels over improving the Northern Ireland Protocol are due to get underway tomorrow and Tory MPs want Lord Frost, the Government's Brexit chief, to secure changes to avoid a 'two-speed UK'.
Lord Frost is under pressure from Tory MPs to ensure Northern Ireland can take advantage of the same Brexit freedoms as the rest of the UK
Sir Iain Duncan Smith, the former Tory leader, said changes to EU red tape should apply to the whole of the UK
Ministers are looking at all of the EU laws which were kept on the UK statute book after Brexit.
Legislation made in Brussels will be 'improved or repealed' if it is judged not to benefit the British people.
The shake-up will include a review of EU restrictions on selling goods in pounds and ounces in what could pave the way for a return to using more imperial units.
Sir Iain Duncan Smith, the Tory former leader, was in charge of an initial Government-commissioned review on EU red tape.
That process resulted in a wave of recommendations on EU laws and rules which could be repealed.
Sir Iain told The Telegraph that Northern Ireland must be treated the same as the rest of the UK.
He said: 'All of the things we do on the GB side must also be relevant to those who live in the United Kingdom on the Northern Ireland side.
'The TIGRR report [Taskforce on Innovation, Growth and Regulatory Reform] is aimed at the whole of the United Kingdom, not just GB. I made that point to Lord Frost.'
The British Weights and Measures Association group said shops in Northern Ireland should be able to sell their goods according to UK rules.
Warwick Cairns from the group said: 'We can see
