This is because migrant birds have arrived in the UK and are making themselves known ... In some cases, such as the song thrush which can be heard at Ham Wall in Somerset where Radio 4 broadcasts ...

Sing on, sweet thrush, upon the leafless bough, Sing on, sweet bird, I listen to thy strain, See aged Winter, 'mid his surly reign, At thy blythe carol, clears his furrowed brow. Thus in bleak ...