You are willing to come and take pics/measurements of mine - I've got one of those from that picture waiting to fit and am in Kidlington so not far from you. Nick.
Only place other than eBay I've seen them for sale Oscar is: http://www.germansupply.com/home/customer/product.php?productid=18356 Will PM you my phone number so you can arrange to come and measure/photograph mine. Nick...
Thanks peasoup. I may have found one, but its one those 'friend of a friend who may have one tucked away' things.