TOP Whitehall officials were caught boasting to EU diplomats that Brexit will be like a KitKat with chocolate covering ties to Brussels for years to come.

Bombshell tapes passed to The Sun reveal senior civil servants secretly pledging to continue spending taxpayers’ cash propping up Brussels defence and foreign projects — including the controversial “EU Army”.

In tapes revealed to The Sun top Whitehall officials are heard pledging to keep using taxpayers' money to prop up Brussels after Brexit

As part of the deal suggested by a Cabinet Office adviser, EU military officials would be based in Whitehall forever.

Our revelation on Thursday night reignited the bitter war of words between Brexiteers and the Civil Service - who were accused of trying to “hoodwink” voters.

Angry MPs said vast amounts of detail about the UK’s post-Brexit plans had been shared with other EU countries before them, sparking claims the officials had “briefed against their country”.

A private conference last Friday saw ambassadors and officials from France, Holland, Belgium, Sweden, Poland and Italy meet the Brits at the London School of Economics to discuss post-exit plans.

Victoria Billing and Alastair Brockbank were among the delegates at the conference at the London School of Economics

European academics also attending were told the discussions were so secret that even the countries that speakers were from should not be reported outside the room.

But one furious attendee blew open the secret chat, telling The Sun: “The public have a right to know what is being carved up behind the scenes.”

Senior Brexit Department official Victoria Billing sparked mocking laughter by describing the defence and foreign policy deal sought by the UK as a “KitKat” – a “cover” hiding the depths of the continued agreement.

And Cabinet Office security adviser Alastair Brockbank - who works for top Brexit negotiator Olly Robbins - told the diplomats that Britain stood ready to continue paying “significant contributions” to controversial common EU defence and foreign policy projects adding: “We are interested in it all.”

Tory MP Jacob Rees-Mogg has demanded an official inquiry into the meeting and said it was wrong for British civil servants to brief the other side behind closed doors Credit: PA:Press Association

And he claimed that Britain could yet fund the Permanent Structured Cooperation that will see 25 EU countries merge their armed forces.

He said as the project grew “we would see what we can contribute towards PESCO still.”

Mr Brockbank boasted that it was civil servants who “are negotiating the detail of that at the same time as we are discussing the political high-level fluffy bits that will go into any declaration that gets made public.”

And he admitted his plans will lead to a nightmare headache for Theresa May, claiming: “Honestly speaking and off the record this has been for us some quite difficult political conversations for us in the UK.”

Last night leading Brexiteer Jacob Rees-Mogg demanded an official inquiry into the meeting, saying: “It is wrong for British civil servants to be briefing the other side in except in a formal negotiation context.”

On our our side, on foreign policy and defence, we are actually looking for something... which I normally call a patchwork but someone yesterday called a Kit-Kat which I rather liked, where you have the cover of, you have the kind of political framework cover and underneath you have a series of different agreements. Senior Brexit Department official Victoria Billing

He hit out: “Former civil servants rounded on Brexiteers a few months ago and compared them to Nazis for questioning the traditions of the Civil Service and now we have civil servants appearing to brief against their country.”

The top Tory added that the “KitKat comment is a clear attempt to hoodwink voters.”

“This looks like a clear attempt to fix the game and this must be formally investigated urgently.”