Hi everyone.
Good news. I collected my car last night from VW & they have managed to get the mark out & the body work is back to how it should look.

HarryR, my car is DBP & shows any marks like yours. I only collected my car in March & having spent a few pennies short of £26K, believe me it's gutting when you get any marks on your car.
I have been told by VW that no protection (Auto Glym etc) will protect the body work from bird sh!t. It will eat through anything & the longer on the paint work, the worse the mark becomes. My valeter has sent me details of a paint protection by Rhino & it seems the product will protect me against the harsh enviroment (UV, traffic film, acid rain and many airbourne contaminants). Oh and I will never need to wax the car again! Cartwell, I would check your protection products, especially against the birds.
Although it cost me £30 + VAT for VW to get rid of the mark, I think it's worth the money. It seems others have the same problem, so it maybe worth speaking to your own VW bodyshop & see if they can remove the marks from your own car.
Alternatively, wait for all the birds to get bird flu & the problems resolved!!