I'd mention it again on the day tooBooked mine in at Loughborough merc dealer today. Goes in end of September.
I mentioned that I wanted to opt out of any software update and the guy said ah well it does state it needs one (he wasn't going to tell me) but its no problem I will put it on the job card that you have requested not to have the update. No problem at all.
Fingers crossed they dont update it then..