Edinburgh House Crow - most likely odd variant corvid

More images have come to light of Saturday's Edinburgh City corvid and it now appears to be some weird juvenile variant rather than a House Crow. Not sure what species it is but Angus Murray has informed me of a population of Hooded Crow/Carrion Crow intergrades in the city which actually take to bird feeders and have been regularly recorded in city back gardens. It could be a throw-back of this unique population (Lee G R Evans)