Unknown bird

Observation - Unknown bird - UK and Ireland. Description: Starling/blackbird size, dark colouring (but partly silhouetted), white stripe below eye, clearly visible crest. Sitting on a guelder rose on a snowy day. Had disappeared by the time I got binoculars out. Garden is on fringe of pastoral countryside and

Starling/blackbird size, dark colouring (but partly silhouetted), white stripe below eye, clearly visible crest.
Sitting on a guelder rose on a snowy day. Had disappeared by the time I got binoculars out.
Garden is on fringe of pastoral countryside and includes native species trees.