The chairman of Marks & Spencer has backed government plans to override parts of the Northern Ireland protocol, saying that some food exported south of the border now requires 700 pages of customs documents, partly written in Latin.

Archie Norman, a former Conservative MP, called on the UK government and EU to come to an agreement, saying the rules for sending food between them were “highly bureaucratic and pretty pointless” given that British food standards were in line with or higher than those of Brussels.

Norman said: “At the moment, wagons arriving in the Republic of Ireland have to carry 700 pages of documentation it takes eight hours to prepare the documentation some of the descriptors, particularly of animal products, have to be written in Latin. It has to be in a certain typeface.”

He said the UK government’s proposal to override parts of the agreement signed as part of Boris Johnson’s Brexit deal and remove checks on goods crossing the Irish Sea was a “triumph of common sense over rules-based mentality” and “will make sure at a time of inflation that the Northern Ireland people can get the fresh food they are used to and are entitled to”.

Norman told the BBC that since Brexit, exporting to Ireland now took 30% more driver time and required the employment of 13 vets in Motherwell, Scotland, to oversee the required checks and paperwork, costing M&S an additional £30m. “It’s very onerous,” he told BBC Radio 4’s Today programme.

The protocol requires similar rules to be imposed on goods travelling between mainland UK and Northern Ireland because of its border with the Republic of Ireland, but the checks are currently being held off under a series of “easements”.

Removing those easements would mean “that every piece of butter in a sandwich has to have an EU vet’s certificate”, Norman said.

“The EU are looking for us to impose comparable controls for Northern Ireland and were that to happen it would mean that quite a lot of products from the UK simply wouldn’t get to Northern Ireland and what does go there would be very very costly,” Norman said.

“Marks & Spencer is a big company, we can make almost anything work, however bureaucratic, but for the small artisan cheesemaker or cake baker it would simply be impossible to export any more.”

Norman said an EU proposal that every product going from the UK mainland to Northern Ireland must be specifically labelled as only for consumption in the UK, for example, would cost M&S £9m a year alone.

He said finding a solution was important in the light of food price inflation which was likely to reach 8% to 10% by the end of this year.

The M&S chair said British consumers were still spending, having built up savings during the pandemic, but warned: “The crunch is not going to be now, the crunch is going to be in the autumn when people come back from their holidays so have spent their money and there is nothing left in the kitty.”

The preference for M&S is that the UK and EU agree to maintain equivalent food standards so checks would not be required. “Our food standards are probably the highest in the world and therefore we should recognise that and let the product flow not just into Northern Ireland but into France and the [Irish] Republic,” Norman said.

“The UK government has been very wary of that. To some extent there has been a hankering after the idea that there might be some opportunity of Brexit, a chance to deviate in the future and the EU of course hasn’t really been prepared to contemplate it.”

A European Commission spokesperson disputed the claim made by Norman about butter in a sandwich heading to Northern Ireland requiring an EU vet’s certificate, noting that this is a “composite product” containing items of both animal and plant origin. For movements from Great Britain to Northern Ireland, the EU’s proposal is to have one certificate by truck, meaning that no separate certificate for the sandwich or any other composite product would be required. For movements from Great Britain to Ireland or any other EU state, a specific composite product certificate would be required, but separate certificates would not be needed for the individual ingredients such as butter and ham.

The spokesperson added: “The EU doesn’t prohibit goods flowing from Great Britain to Northern Ireland. What we require is the UK government to provide us with a minimum set of information about these goods, as well as to implement basic labelling requirements, such as affixing a simple sticker, to make sure they are destined for the Northern Ireland market and will not continue to the EU Single Market. Despite our proposals, it is unfortunate that the UK government has not engaged sufficiently to solve this issue.

“These limited checks and controls avoid the need for the introduction of checks and controls on the land border between Ireland and Northern Ireland – something that goes directly against the Good Friday (Belfast) Agreement that should be protected in all its dimensions.”

• This article was amended on 18 May 2022 to add a European Commission response received after publication.