Reform UK leader Nigel Farage will stand alongside other party leaders at the Cenotaph for the first time during the Remembrance Day service in November.
The appearance follows his victory in the Clacton by-election, which restored his party's parliamentary contingent to eight Members of Parliament as he attempts to revive Reform UK's fortunes.
Under a 1984 protocol, a Westminster political party must hold at least six seats in the House of Commons to have the right to lay a wreath at the National Service of Remembrance.
A government source confirmed that the protocol is governed by a 1984 agreement between the Queen, the then Speaker of the Commons, and Westminster party leaders. Parties with two or more seats, but fewer than six, are permitted to view the service from the Foreign, Commonwealth and Development Office building.
Mr Farage had triggered the contest in Clacton to halt a growing media clamour over Reform UK's finances. The win brought the party back to eight MPs, up from five in November last year following high-profile defections from the Conservatives.
National Remembrance Service eligibility
Joining the Prime Minister and other party leaders at the Remembrance ceremony has been a long-standing ambition for Mr Farage, who is an aficionado of military history. He views standing at the Cenotaph, the national war memorial on Whitehall in London, as a symbol of his breakthrough into the political mainstream.
The ambition comes despite his claim that the Clacton win "stuck up two fingers to the entire political establishment."
Internal party tension and spokesman row
The by-election victory comes after a period of febrile Westminster speculation regarding Mr Farage's health and long-term commitment to the leadership. Close allies are urging him to "turn off his phone and have some rest."
Those same allies are also urging Mr Farage to "reboot" the party by dismissing home affairs spokesman Zia Yusuf. Mr Yusuf annoyed Mr Farage last week by describing Tory former Defence Secretary Ben Wallace as "a traitor to Britain" for allowing into the UK thousands of Afghans who had served Britain during the war in their country.
A source stated: "Nigel has fallen out of love with Zia, who is out of control. I think his days are numbered. Rupert only left because Zia went for him so hard over some HR nonsense. If Zia goes, Rupert could be persuaded back."
Rupert Lowe is the leader of the breakaway right-wing Restore party.
By-election victory and security threat
Mr Farage won 63 per cent of the votes in Thursday's election, which was dubbed a "pointless farce" by the Conservatives following a boycott by the main political parties.
He failed to turn up at the declaration at the Essex town's leisure centre, where he would have been pictured beside joke candidates led by Count Binface. Reform UK claimed there was "a credible threat" against him.
Standards inquiry and finance probe
Within hours of the declaration, the Parliamentary Commissioner for Standards restarted its inquiry into Mr Farage over an alleged "failure to register an interest" regarding a £5million donation from crypto-billionaire Christopher Harborne.
The standards investigation could potentially lead to another by-election in the constituency.
