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The Brexit process could be too complicated for British politicians to manage and could overwhelm Parliament for years, experts have warned.

A paper by King's College London academics argues the complexity of leaving the EU could prove beyond the capabilities of politicians, civil servants and British courts.

The alarming report was put together by The UK in a Changing Europe, an academic group commissioned by the Political Studies Association.

Its director, Professor Anand Menon, claimed Brexit will "test the UK’s constitutional settlement, legal framework, political process and bureaucratic capacities to their limits – and possibly beyond".

"In voting to leave the EU, the British people have unleashed a process potentially as complex as it is unpredictable," he said.

The report argues that, even after the "hideously technical" negotiations over Article 50, which is set to be triggered next March to kick off the Brexit process, the British establishment has a mountain to climb.

Prof Menon said: "Article 50 negotiations will be tricky and hideously technical but that is the easy bit.

"When it comes to the crafting of a future relationship, almost everything is up in the air.”

Parliament will be swamped with the fallout from the Government's so-called "Great Repeal Bill", it argues, and huge amounts of time will be spent identifying EU laws before deciding whether to keep them.

And the report claims the whole fabric of the British constitution could be put under great strain, with the potential to undermine relationships with Scotland and Northern Ireland.

Civil servants, in particular, will be challenged, it is claimed. The focus on Brexit could distract from domestic issues and could possess a lack of "sufficient knowledge" about policies.

Professor Menon also criticised "pathetic" pro-Leave campaigners who have tried to play down the immensity of the challenge in the face of so-called "Remoaners".

"An irritating aspect of the current debate is the tendency of Brexiters to accuse those who warn of difficulties of ‘talking Britain down’," he said.

"It’s a good line but a pathetic argument. Since when was rational debate a bad thing?

"Forewarned, surely, is forearmed and this report will help identify potential stumbling blocks ahead.”

The report comes as the the Confederation of British Industry warned the UK economy could slow sharply next year, slashing its growth forecast from two per cent to 1.3 per cent.

It is calling on Chancellor Philip Hammond to deliver on an "ambitious domestic agenda" in next month's Autumn Statement to help boost business confidence.