The battle has been lost, but hard-line Remainers believe the war can still be won.
Already, pro-EU activists are trying to mobilise supporters to campaign for Britain to rejoin the European Union.
Although Brexit has yet to be completed, Remainers now accept it will be, after Boris Johnson's emphatic election victory.
But some are convinced British voters can be persuaded to opt to rejoin the EU at some point in the near future.
Dozens of social media groups are being set up around the country to galvanise a grass-roots Rejoin movement.