I'm a vain, deluded, old fool.
I'm in the process of applying for a new passport. You only have to get your photos endorsed if you 'are so changed from your previous passport photo as to be unrecognisable'. So of course I didn't bother. I don't think I look greatly different to how I did in my mid thirties.
Apparently I'm wrong.
My application just got knocked back because I didn't get my photos endorsed.