Thanks for the edit and tagging me, Nausea. kek
IMO, Adolf let the British escape as it was always his intention (as an Anglophile) to make peace with Britain. He made numerous peace offers in 1940-41 - even including pulling out of France and the Benelux and offering troops to protect Britain from Germany's own allies and the Soviets - as his only war goal was lebensraum in the east.
The great Rudolf Hess' mission to Scotland was to offer peace to King George VI through the Duke of Hamilton. Disgracefully, Hess was kept in the Tower of London and confined elsewhere until Nuremberg, where he was laughingly charged for 'crimes against peace', despite leaving Germany on a peace mission before Barbarossa and the supposed 'holocau$t'. Hess was kept in Spandau Prison for 41 years (21 of those on his own) until he was killed by an Allied guard in 1987, which was claimed to be a 'suicide'.
With the Phony War lasting from September 1939 to May 1940, there was a strong peace movement in Britain until the aerial bombings were escalated by the drunken warmonger Churchill leading to the Blitz, which fired up the British into total defiance. The British lost their Empire for Poland, which they had to let Stalin keep after the war. Churchill was a fraud, who needed to survive a war with American help to cement his place in history as anything other than a failure, despite the war being an utterly pyrrhic one for Britain, who finished the war bankrupted, on rations for ten years and it's Empire collapsing rapidly over the next 25 years. It was an unnecessary war.