I have received an update on my order. Apparently my order has now been assigned a build week for the end of August 2023. I ordered my Clubsport right at the end of March 2022.
Though I asked the dealer to clarify what he meant by "assigned"

And as I suspected this is a provisional date, and not 'locked in' with the factory. So whilst it is some good news at last, as I was told at the start of the year not to expect my car until 2024, I'm not getting my hopes up.

Gone from 12 months at point of order (which I took with a pinch of salt), to building in May '23, to July '23, to no build week, to now August 2023.