A bit more info.....
A couple of things I forgot to mention. The place to send your email with the digital photo is customer.service@bmw.co.uk. Also, I got a business card off the local service rep so that I could cc him on it. I saw this as belt and braces in that the dealer a) appreciates that you are serious; but more importantly b) must provide an accurate report as he knows that bmw service already has a picture of it in their files!
On a separate note, I think the rear screen also has a design fault on this model. Like many others I had the milky delamination and associated failure of big sections of the heated rear screen so I broke open another piggy bank to have Autoglass replace it. When I inspected the work I saw that the vertical rubber edge seal (which is not glued to the screen) only just covered the edge of the glass. In places, it was not even in contact, with a gap of 1/2mm. Autoglass had used OEM parts (I inspected them before they started work) and said they had followed the maker's installation guide. Clearly this was a capillary opportunity and for my money is what caused the initial problem. To protect the new one I had Autoglass apply additional bonding adhesive so that the exposed electrical conductor strip was totally sealed in. They were very good about it and happy to do as I asked, even though this was a non-standard procedure - the main thing is my lifetime warranty is still valid. Anyone contemplating a similar investment in rear glass might want to think about this. I can provide the branch details and fitter-supervisor's details if needed.
Now, does anyone know about changing the front aircon radiator fan? Mine has a shot bearing which is loose to the touch and rattling when spinning. Is this a DIY job?
Cheers
SG