Quite possibly Jeremy Corbyn will not be having the best Christmas ever this year. On the other hand, who knows? He was never a man ambitious for high office.
His ascension came about because the UK Labour party needed the appearance of pluralism in its post-2015 leadership election, and so Andy Burnham, the left Blairite frontrunner, lent him the nominees required to get on the ballot. The reformed Labour party electoral structure put in by Ed Miliband did the rest, empowering a vastly expanded membership to overcome the parliamentary party, and give them a man many of them loathed as leader.
Corbyn, said to be reluctant once actual victory loomed, did his duty. Miliband had done his; he was the son of a Mitteleuropean intellectual father, whose life's work was to convince people that the UK Labour party was a conservative, establishment organisation whose historical role had been to frustrate the working-class path to socialism.