Boris Johnson and Theresa May are leading a pack of at least 10 senior Conservatives tipped to be contenders in the battle to succeed David Cameron as Prime Minister of the UK.
Brexit campaign frontman Johnson summoned friendly Tory MPs to his Oxfordshire home on Sunday in likely preparation for a run at the party's leadership, as the British Home Secretary Theresa May was reportedly sounding out colleagues.
Johnson yesterday insisted the UK will always be part of Europe and enjoy "intensifying" co-operation with other nations, as he set out his vision of post-Brexit Britain.
Writing his weekly column in the Daily Telegraph, Mr Johnson said: "There were more than 16 million who wanted to remain.
"They are our neighbours, brothers and sisters who did what they passionately believe was right. In a democracy majorities may decide but everyone is of equal value.
"We who are part of this narrow majority must do everything we can to reassure the Remainers.
"We must reach out, we must heal, we must build bridges - because it is clear that some have feelings of dismay, and of loss, and confusion."
'EU citizens living in Britain will have their rights fully respected'
Mr Johnson expanded on his vision of post-Brexit Britain, writing: "I cannot stress too much that Britain is part of Europe, and always will be.
"There will still be intense and intensifying European co-operation and partnership in a huge number of fields: the arts, the sciences, the universities, and on improving the environment.
"EU citizens living in this country will have their rights fully protected, and the same goes for British citizens living in the EU.
"British people will still be able to go and work in the EU; to live; to travel; to study; to buy homes and to settle down. As the German equivalent of the CBI - the BDI - has very sensibly reminded us, there will continue to be free trade, and access to the single market."
'No great rush'
He went on: "The only change - and it will not come in any great rush - is that the UK will extricate itself from the EU's extraordinary and opaque system of legislation: the vast and growing corpus of law enacted by a European Court of Justice from which there can be no appeal.
"This will bring not threats, but golden opportunities for this country - to pass laws and set taxes according to the needs of the UK.
"Yes, the Government will be able to take back democratic control of immigration policy, with a balanced and humane points-based system to suit the needs of business and industry.
"Yes, there will be a substantial sum of money which we will no longer send to Brussels, but which could be used on priorities such as the NHS. Yes, we will be able to do free trade deals with the growth economies of the world in a way that is currently forbidden."
Rivals for Tory leadership
Theresa May (pictured) is thought to be the main contender to take on the former London mayor and a plot dubbed "ABB" (Anyone But Boris) has reportedly begun, organised by ministers and aides loyal to Mr Cameron.
Other challengers could also include pro-Remain MPs Sajid Javid, the Business Secretary, Education Secretary Nicky Morgan, Work and Pensions Secretary Stephen Crabb and Energy and Climate Secretary Amber Rudd.
Despite once saying the Health Secretary brief was his "last big job in politics", Jeremy Hunt is also reported to be among those considering a shot at the leadership.
Prominent Brexit campaigners Andrea Leadsom, minister for energy and climate change, and work and pensions minister Priti Patel are expected to stand, according to reports.
Meanwhile former defence secretary Liam Fox was the first potential contender to break cover, admitting he is "thinking about" standing to replace Mr Cameron.
Mr Johnson was pictured welcoming Remain campaigners Jake Berry, Amanda Milling and Ben Wallace, alongside Leave's Nigel Adams to his Oxfordshire home on Sunday.
Mrs May, touted as the "stop Boris" side's candidate, was also reported to be canvassing support among MPs ahead of the battle to replace the PM.
She has been silent since Friday's bombshell EU referendum result sent shockwaves through Britain's political system as the country questioned how Brexit could be delivered.
The pair, who are expected to announce their intentions this week, have been urged by Cabinet minister Justine Greening to form a "united leadership" to help bring together a country left divided after the poll.
The International Development Secretary said if Mr Johnson and Mrs May were unable to agree, another pair of MPs from either side of the referendum divide could step forward to "bring Britain back together".
Cameron said October, others suggest January for new Tory leader
Mr Cameron announced his intention to leave Number 10 in the wake of the referendum defeat and said he would like his successor to be in place by the time of the Tory party conference in October.
Mr Fox suggested that the timetable set by the PM should be extended to January 1 with candidates making their pitches at the October conference before MPs decide the two-person shortlist.
That would allow extra time for an outsider - such as Leave campaigner Mr Fox - to build momentum in their campaign for the leadership.
The Brexit-backer made his comments after former leader Iain Duncan Smith said the new Tory prime minister must come from the Leave camp.
Mr Duncan Smith's hardline stance would rule out Mrs May for the top job.
"It would be very, very difficult for the public who have voted for leaving the European Union to find that they then had a prime minister who actually was opposed to leaving the European Union," Mr Duncan Smith told BBC One's Andrew Marr Show.