I said on another thread that he mentioned it last year
"The French are always grumpy in October, the anniversaries of Trafalgar and Agincourt upset them." (Twitter 2/11/21)
On Twitter no less, amazingly. He's also mentioned Agincourt during a filibuster in the Commons. He knows what day it is, unlike practically all the British and the French who have moved on from the events of 600 years ago, I think most of us only made the connection because of the St Crispin's Day speech.
A lot of his studied affectations would only merit a raised eyebrow if he wasn't in a position of power. He isn't harmless, though.