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Yes, well done...look at those large, blotchy spots going all the way down to the tail underneath. In comparison, Song has arrow-head spots which fade away before the legs. Also, the rather greyish upperparts colour, with pale whitish edges to the coverts on the wing, is typically Mistle. Song are far brighter brown above with yellowy-buff tips to any covert feathers (though adults' wings are plain).
Mistle is also a big brute of a bird compared to Song, but that can be difficult in a lone bird.
My Flickr photos...
Lat/Lng: 53.0211, -1.176
OS grid ref: SK553474