On June 27, David Cameron issued this statement: "I will continue with my duties as the MP for Witney. It is an enormous privilege to serve the people of West Oxfordshire."

So enormous that he could only bear it for a few more weeks, apparently. He's off, leaving the Commons and triggering a by-election in Witney: some lucky Tory will soon inherit one of the safest and prettiest seats in the country.

What does this tell us about Mr Cameron? Nothing terribly positive, to be honest. Let's remember, he fought the EU referendum campaign promising not to quit if he lost, then quit when he lost -- but only having clung to office as long as possible and having banned the Civil Service from doing any preparatory work for Brexit, thus making it harder for his successor to actually get on with the job.

In between breaking his promise not to resign as PM and breaking his promise not to resign as an MP, the only significant official work he undertook was drawing up an honours list handing an OBE to his wife's stylist and a knighthood to his press officer.