You could add from the RAC foundation that most new cars are traded within 4 years of first ownership.Thanks, I'm watching the thread now and best of luck to you!
I hope you don't mind me reproducing the paragraph below from your lawyers' letter, I think it's relevant to the UK litigation:
"It is plainly unreasonable that a customer should have to wait more than four years for a product it has already paid for to be supplied, even if that product was “upcoming”. According to the English dictionary, the word “upcoming” means “about to happen”, “happening soon” or “forthcoming”. It cannot be reasonably argued that FSD was “about to happen”, “happening
soon” or has been “forthcoming” in the context of a customer purchasing a product and
expecting to receive that product soon when that customer does not receive the product after four years."
On that basis, “upcoming” hasn’t even fallen within the life span of the majority of new car buyers.