Re-commissioning the car, last used and scrutineered Snett 2023, here's the photo with sticker, anybody know if it's still legal for 2cv racing use?
Now cleared up with a quick answer form the every helpful Andrew Bull - yes it's legal!
There are actually no specs mentioned for seats, it just says "Have a normal adequate seat for the Driver"!
Since the seat pre-dates introduction of the HANS device, check that the headrest isn't positioned such that it pushes your head forward. I think that the headrest of later seats was moved further back to allow space for the thickness of the HANS device between the back of the helmet and the seat.