Hi Jon
Sorry to hear you've had issues only after 11 months of ownership.
It seems like a common fault with a lot of different makes and models nowadays, mainly due to how cars are driven with modern day traffic congestion where first and second gear are the most common gears in use and also the power surges transmitted through the transmission at low gears (harsh acceleration in 1st gear, power on and off).
I'm sure that's not how you drive it but unfortunately, it seems like the majority of younger drivers are that way and you may have inherited any previous abuse that may not be noticeable until some time later.
It seems the attitude of Driving Instructors is that it is 'gears to go and brakes to slow'...an absolutely ridiculous statement and one that leads to harsh acceleration and braking. This also leads to undue strain being applied to the clutch, gearbox and dual mass flywheels.
To summarise my ramblings, it may be a case of biting the bullet and getting another gearbox (reconditioned with modified parts) to rectify the fault.
If BMW were to maybe supply you a clutch kit as a gesture of good will then that may take the sting out it slightly?
Keep us updated on how you get on with it all
Cheers Trevor