Welcome to the bubble roof group!! :rofl:
Mine is a 2011 and I had the same issue as yourselves, as did a couple of other owners. I first contacted Sytners (Nottingham) in August 2019 and basically felt like they really didn't care or wanted to know about it (I wasn't the original owner, probably wouldn't normally take my Z to a BMW dealer, never buy a new car from them etc, etc). Either way, and after numerous times chasing them I finally got an answer back in March 2020 and booked it in for 22nd. When I got there they did not have a booking for me in and no loan vehicle either. The manager was in and they said he'd ring me back.... he did not. That night Boris issued Lockdown for the next day, so pleased I wasn't able to drop the car off now!!
Anyway once lockdown was raised I contacted Sytners back and was told I'd have to wait as they had a backlog of work (no sh*t, yeah mine form their balls-up! :x ) so had to wait another month. So all sorted, almost a year after I started it all off, but sorted. Continued the rest of the nice weather with the roof down as much as I could, but it was a nice repair job.
Start of the bad weather and I'm driving with the roof up more and more and I'm noticing a knocking coming from above me and a wind noise from behind the right shoulder that I wasn't aware of previously. Turns out they have broken a wire clip in the roof panel and the wire is sometimes knocking around and when they rebuilt the roof they managed to miss-align the rear roof gutter section. I've repaired both of these myself now as I really didn't want it going back to them.
So I wouldn't really recommend Sytners in Nottingham (wish I'd gone to Sopers in Lincoln now) as I don't feel I received a level of service you should expect from a BMW dealer.
I am happy with the repair, just not the level of service and attention to detail (I'm not including Lockdown delays in that as it wasn't their fault).