Theresa May will urge leaders from the devolved administrations to "pull together" to back her Brexit agreement as the Government ramps up its no-deal preparations.
The Prime Minister is set to call on the First Ministers of Scotland and Wales and representatives of the Northern Ireland Civil Service to listen to businesses and get behind her Withdrawal Agreement in a Downing Street meeting on Wednesday.
But with just 100 days to go until the scheduled date of Brexit on 29 March, Mrs May has upped preparations in case the UK crashes out of the European Union without an agreement - while Defence Secretary Gavin Williamson announced that thousands of troops will be put on stand-by to help with potential disruption.
Around £2bn has already been allocated for spending by Whitehall departments for Brexit preparations, and Chancellor Philip Hammond announced on Tuesday evening how a further £2bn will be shared out in 2019/20 - prioritising borders, trade and security.
Twenty-five Government departments will receive additional money, with the Home Office set to receive almost one quarter of the sum - £480m - to increase Border Force capability with "hundreds of new officers", and to help it prepare the EU Settlement Scheme.
A 100-page information pack telling businesses of possible changes to the way they trade with EU states will go live online on Friday - with 80,000 emails going out to firms thought likely to be most affected.
And advice to private individuals will be issued over the coming weeks through adverts, websites and direct communications. Areas expected to be covered include bankcard payments in the EU and travelling to the continent with pets.
On Wednesday, the Home Secretary will unveil plans for the UK's post-Brexit immigration system in a much-delayed White Paper which the Government says will mark the end of free movement.