Major UK supermarket chains person warned that Northern Ireland Protocol costs could "force" retailers to power from British suppliers to EU suppliers.
The protocol is simply a acceptable of rules jointly agreed betwixt the UK authorities and the EU to modulate post-Brexit commercialized to and from Northern Ireland.
It led to checks connected immoderate goods moving from Great Britain to Northern Ireland.
Six supermarkets assertion the adjacent signifier of checks volition thrust up costs some for them and Northern Ireland consumers.
Representatives from Tesco, Asda, Sainsbury's, Co-op, Iceland and Marks and Spencer person sent a associated missive to the UK authorities and the European Commission to item their concerns.
Together, the six retailers correspond much than 75% of Northern Ireland's market market, according to the British Retail Consortium, which co-ordinated the letter.
The missive appeals for enactment to forestall disruption to trade, truthful UK supermarkets tin "continue to supply the radical of Northern Ireland with prime and affordability".
The Northern Ireland Protocol was agreed successful October 2019 successful a bid to forestall post-Brexit checks on the Irish borderline connected goods moving betwixt Northern Ireland and the Republic of Ireland.
The UK and the EU decided that goods checks should alternatively beryllium carried retired astatine Northern Ireland ports, which is wherefore the protocol is often referred to arsenic the Irish Sea border.
The protocol keeps Northern Ireland successful the EU azygous marketplace for goods and means EU customs rules are enforced astatine its ports.
It came into unit connected 1 January 2021 but the rules are being phased successful gradually successful a bid to support nutrient supplies and to springiness retailers times to accommodate to the changes.
So-called grace periods were introduced, during which definite products are not yet taxable to inspection.
Last month, the EU agreed to a three-month hold to its projected prohibition connected immoderate chilled nutrient products from Great Britain - including caller sausages and mince - from being sold successful Northern Ireland.
The chilled nutrient regularisation is present acceptable to travel into unit successful October.
"The extremity to the Northern Ireland grace play looms successful the caput of each British retailer with proviso chains successful Northern Ireland," said Helen Dickinson, the main enforcement of the British Retail Consortium.
"If nary enactment is taken, past it volition beryllium the radical the Northern Ireland, with fractional of the discretionary income of Great Britain households, who carnivore the brunt of this stalemate - meaning little prime and higher costs for indispensable nutrient purchases."
The missive from the six supermarkets was sent to the UK's Brexit Minister Lord Frost, and Maroš Šefčovič, vice-president of the European Commission.
"Our members made important investments successful the past fewer months to debar disruption, yet disruption volition go inevitable if the authorities that volition travel into unit successful October is unrealistic and disproportionately onerous," Ms Dickinson said.
"Retailers person shown their compliance; the authorities and EU indispensable present assistance america by removing the barriers to GB-NI proviso chains."
Last week, Lord Frost acknowledged that trading problems associated with the Northern Ireland Protocol had contributed to a emergence successful cross-border trade betwixt Northern Ireland and the Republic of Ireland.
He said this was "in galore ways a problem" adding that it showed that galore Northern Ireland firms could not usage their archetypal prime suppliers.