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Willow vwarblers are mainly away back to Africa by the winter months, though milder winters mean that warblers often stay longer. It might be worth having a look at the animated maps and annual records on the BTO site which gives a really useful picture of what is around at any time.
The plant is also interesting - Leycesteria formosa I think. This is a great winter food source and was popular with overwintering Blackcaps that I used to get in my Belfast garden (probably migrant european birds).
Thank you for sorting out my mistake with the ID of this bird.I had looked at this picture for so long I eventially convinced myself that it wasnt a chaffinch.I never realised how yellowy/green they could appear.
The plant is a Leycestria and the berries are greatly sort after by Blackbirds and Song thrushes as i have seen so far.I will keep an eye out for others.
Lat/Lng: 53.859178982625, -1.9184553623199
OS grid ref: SE054403