It used to be thought that the origin of our wintering Blackcaps was central Europe but recent research using birds with geolocators has shown that they come from several countries, including Spain, France and Germany. Birds wintering in Britain originated from breeding areas in an unexpectedly broad expanse covering much of western and central Europe, remarkably extending south to latitudes occupied by the species in winter. Their autumn migrations ranged from northerly (e.g. from Spain) to westerly (e.g. from Poland). This strategy enabled them to use shorter migration routes.
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Yep the Blackcap come from Eastern Europe. Plenty of chiffchaff around as well

Yesterday afternoon, when exercising,  we noted our highest concentration of winter thrushs on a field just south of Perry Hill Farm nr Somerton.  We reckon at least 150.
A few days earlier we had noticed a tractor spreading muck on the field, so presume there is something tasty to eat in the muck.
We have also noted several blackcaps around Somerton and some plain warblers we assume are wintering chiffchaffs.
We understand the Blackcaps have not summered here but have moved in from further North.

Yesterday whilst exercising around Somerton we noticed an increase in Redwings on fields near Sutton Road Railway Bridge and beside old Radio station. Smaller number of fieldfares.

Also noted a large flock of Linnets feeding, 1 or 2 kestrels,

This morning we have been pleased to see a male blackcap return to our town garden and compete with starlings to peck at fat balls.