...what? Among other things, that seems like odd programming to me: I'm surprised they didn't just have a single list as an object somewhere.

It does seem to me that "titles are obligatory" is more common on UK than US websites: my experience with American ones is that even if they ask for binary gender elsewhere and don't let you refuse, they seem to usually treat title as optional. I'm not sure why this would be different, though, and I've certainly not done any competent sampling.