Scops owl in Durham?

Taking the dogs out for their evening walk tonight, we heard a call that's completely new. After researching on the internet, it is totally identical to the scops owl, which unfortunately shouldn't be anywhere near here! Has anyone else been aware of them in this area? I guess it may just be an escape, but would be nice to think it was a bit lost on its travels. We're in good owl country here with tawny, barn, long eared and little owls locally, and short eared just a bit further up the valley. I don't have anything to get a recording on, but this recording is identical http://www.owlpages.com/owls/species.php?s=510. Thanks for any thoughts!