Today the prime minister Rishi Sunak appealed to the all-important constitutional history geek constituency.
Suddenly timelines were full of “actually, the last prime minister who…” comments, as constitutional history nerds competed to show off their knowledge of precedents.
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(On that point, here is a question - who was the last foreign secretary not to be a member of parliament?)
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The appointment of former Prime Minister David Cameron as Foreign Secretary has all been a lot of constitutional fun, and it is not without significance.
The governing party is in such a predicament that the sacking of the Home Secretary could not be followed by the appointment of another elected politician.
Perhaps that is because of the lack of quality in the parliamentary party; or it is perhaps the governing party is so split that only an outsider can be fitted in without toppling the leader.
Whatever the explanation, it does seem to be an indication not of prime minister strength, but of weakness. And, in part, the weakness was there when the now sacked Home Secretary was appointed by Sunak.
The United Kingdom appears to have a presidential system, but the marked feature of our politics over the last fifteen years is the weakness of the office of Prime Minister.
At the Cenotaph yesterday were two former Prime Ministers, John Major and Tony Blair, who between them had been in office from 1990 to 2007; next to them were six Prime Ministers who had been office in the sixteen years since.
Perhaps that is an accident; perhaps political circumstances have meant that, for a while, there happened to be a rapid turnover of Prime Ministers.
Or it could actually be a meaningful trend, and lengthy periods in office will seem as long ago as figures such Major and Blair themselves.
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Anyway it has been an interesting day for constitutional history nerds.
(And the last foreign secretary not to be a member of parliament? That was Dominic Raab, between the dissolution of the old parliament and the election of the new parliament in 2019 - which the constitutional history super-nerds among you would have known.)
You have to admire one aspect of this appointment (this article being a case in point): who is now talking about Mrs Braver.... what was her name again???
Last FS not to be a member of parliament was Raab during the 2019 election
Last FS not to be an MP (excluding dissolution periods) was Peter Carington, Lord Carrington 1979-1982
Last FS not to be in either house of parliament (excluding dissolution periods) was Patrick Gordon Walker 1964-65 (he lost his seat in the 1964 election but was nonetheless appointed as FS until a by-election came available. He resigned after losing the by-election)