Red berried plant for ID please

Red berried plant for ID please

Observation - Red berried plant for ID please. Description: I don't know what this is. A garden escapee maybe? It is growing on common land, heathland, but there are some gardens close by and there is only one specimen of this plant. Thanks for looking.

I don't know what this is. A garden escapee maybe? It is growing on common land, heathland, but there are some gardens close by and there is only one specimen of this plant. Thanks for looking.