Hi I am bad enough when all the feathers are together on a bird, so I am useless with just a feather! :D
There doesn't appear to be a good feather identification online, but it is worth starting with the RSPB bird identifier (www.rspb.org.uk/.../bird-identifier), where you can put in place and feather colours to help narrow it down to start.
Going from that I found a photo of a similar feather on Google (www.barnowlsurvey.org.uk/.../Bird+feathers) specifically the photos of the Little Owl feathers.
Not sure if that is any use, but hopefully it is a help.
It's too spotty to be a pheasant feather.
featherbase.info is a good site, with lots of examples and measurements, but doesn't have all species or a search function for characteristics.