Try the owners of Panshanger airfield, Hertfordshire. The airfield closed last week and there are quite a few Blisters that would be available since the lot is going to be bulldozed for housing.
Here are some examples, images taken last week..

http://i126.photobucket.com/albums/p117/DASharp/Panshanger45.jpg

http://i126.photobucket.com/albums/p117/DASharp/Panshanger42.jpg

http://i126.photobucket.com/albums/p117/DASharp/Panshanger25.jpg

http://i126.photobucket.com/albums/p117/DASharp/Panshanger24.jpg

And a Robin type or similar…

http://i126.photobucket.com/albums/p117/DASharp/Panshanger19.jpg