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They are summer visitor's not winter so leave in September and return next May
It will still have a first winter plumage, though! The feathers it retains through the winter (wherever that is) are its first winter plumage. This looks to be juvenile plumage still, with quite a lot of pale feathers retained: It is probably still moulting the ones on the face and head, but will retain some on the shoulders and wings through the winter. So it is a juvenile going into its first winter plumage, as suggested by Graham.
My Flickr photos...
Not really made clear in notes,just says first winter bird,so can easily be miss interpreted
The basic succession of moults of small migrant birds that breed in the UK is that after fledging they are in juvenile plumage, then prior to migrating to their winter grounds they will moult into first-winter plumage, as this bird is the process of doing. By the time young Spotted Flycatchers return in the late spring of the following year, they will have attained adult plumage. The young of some species, such as Wheatears, will return in first-summer plumage and moult into adult plumage whilst still in Britain. Larger species, such as gulls, can take up to four years to reach full adult plumage and the succession of moults results in juvenile, first-winter, first-summer, second-winter, second-summer, etc. until adult plumage is finally attained.
Lat/Lng: 51.2699, -0.1453
OS grid ref: TQ294539