I've just finished reading Robert Harris's alternate history novel, "Fatherland".
The back-story of the novel includes the starving of Britain into surrender by 1944 by means of a U-Boat campaign that followed the discovery by the Nazis that the Enigma code had been broken.
It is mentioned in the novel that Edward VIII returned to Britain to reclaim the throne, that George VI went into exile in Canada and died in 1952 and that, in 1964, before US President Joseph Kennedy senior's scheduled visit to Germany, Elizabeth II is still recognised by Canada, Australia, New Zealand and the US as the rightful British monarch.
But there is no mention in "Fatherland" of whether or not Britain was occupied by the Nazis after its surrender (The mention of an SS academy at Oxford doesn't necessarily indicate that Britain was occupied in this alternate history because the appeasers, e.g. Lord Halifax, might have formed a government and provided benefits to the Reich, thus making occupation unnecessary and possibly preventing deportation of Jews from Britain).
The Wannsee Conference is featured prominently in the plot of the novel.
In Harris's alternate history, would Britain, Ireland, Sweden, Finland, Italy, Spain and Portugal have maintained nominal sovereignty without deporting their Jewish residents "to the East"?