Forgot to post an update here, got an email last week confirming finance/part ex details, phoned the online team to change a few things.
Was told I'll be contacted in the next few weeks to finalise finance and do a bank transfer, test drives 2nd half of this month, delivery start of dec but they plan to have delivered all cars currently at Derby by end of december latest.
Delays caused by brake ECU as others mentioned, and that all dealers should have a list of accessories and have been instructed to call customers to let them know the options, so was surprised to find out I hadn't been updated on that. Also was told the reservation fee can be put towards deposit now after it previously couldn't be. And the interest rate on finance will be honoured for all who ordered a car under it, regardless of delivery time.
He apologised for the lack of info and said they've been as much in the dark as others, having to check through notes for any snippet of information he had.
Also was told that there is no UK track warranty for the GR86... And that warranty claims made for anything that breaks during a track day will be on a case by case basis, and if it could be attributed to the track day or driving situations which happen during a track day then it's likely not to be granted. Seems a bit of a shame considering in the US they're giving a free year membership to NASA...
https://gr.drivenasa.com/