Strange Bird

I think this is a juvenile blackbird but only because there's two of them, identical, and they are going in and out of the hedge with a proper, black, Blackbird!
When I've seen juveniles before they have always been brown, rather like the females. These are very pale underside with bars/spots on the sides. (Edit Note - General opinion is that they are Fieldfare, borne out by the grey head I think. Funny how they are interacting with the Blackbirds).
If anyone has any other ideas I'd appreciate your thoughts.
They were certainly tucking into the Pyracantha berries, even shaken them off the bush to make them easier to pick up.