Redwings

 A little party of 4-5 Redwings have been feeding daily on the berries of a viburnum tree in my tiny London garden, since the beginning of February. I've never noticed them here before. Not being very knowledgeable, at first I thought they were thrushes.

I believe they are winter visitors from Scandinavia. Can anyone tell me  how long they will be staying, or anything else about them? 

Sarah
West London