This is a Hooded Crow (Corvus cornix), in size and behaviour it is very similar to the Carrion Crow, in fact for a long time it was thought to be a subspecies. It is now recognised as a separate species.The main obvious difference is that grey hood, which gives it it's nickname of "Hoodie".
In Britain they are mainly restricted to the West and north of Scotland.
To see the rest of this coven of crows just follow the links...
Lovely shots of the black brigade - each one of the birds beautiful in their own right -- this hooded crow has wonderful markings on his "hood " feathers . fav