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Could this be a sparrowhawk's tail feather? How big was the feather?
It was about 20cm long.
Sparrowhawk tail feathers are grey with dark brown bars. The tip of the feather has a dark band and there are only 4 or 5 dark bars.
This looks like an Owl feather, and is a wing feather, with loose plumes on the inner edge. Pretty sure it is a Tawny Owl.
My Flickr photos...
The loose plumes on the inner edge baffle the air flow in fight, enabling owls to strike silently, coming out of nowhere.
I had a similar feather brought to me last weekend, from Southampton. Perhaps tawnies moult at this time of year?
Thank you all for the information :)
Lat/Lng: 52.5724, -1.8435
OS grid ref: SP107971