Cheers Steve, noted.
For what it's worth, the MMI worked straight away when paired with my phone (Galaxy S9) via Bluetooth. Both calls and streaming music via Deezer worked very well. I thought I'd have to go out and buy a Bluetooth cable but apparently not.
MMI version is HN+_EU_AU3G_PO530
Haven't tried the controls on the steering wheel yet however.
Cheers