OK, it's off. I was right - they are a bugger to remove! You have to take out the lower one as well because the bracket on the upper one can't be wriggled past it.
Anyway, the good news is that it has minor score marks at the very top for about half an inch, then the rest is as clean as a whistle.
So Harry, what's it worth to you? I'm a generous soul, but remember I have just spent nearly an hour on my knees in the cold garage.
For postage, it weighs 450g snug in a jiffy bag. I have a Paypal account (PM me) and can post it tomorrow via whatever method you prefer.