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If correct and I'm not good on Galls the Common Spangle Gall is caused by a tiny gall wasp, Neuropterus quercusbaccarum.
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
Thank you for identifying this - I initially thought it might be a gall, but thought it would be better attached to the tree if that were the case.
Lat/Lng: 53.712344, -1.931727
OS grid ref: SE046239
53.712761,-1.93392 google Found on canal footpath, opposite woodland and A646, Throstle Mount, HX2 6BN. More rural than urban at the site.