Cetti’s Warbler adult

Cetti’s Warbler is a resident species in the UK and across much of its range in southern Europe. The number of Cetti’s Warblers has greatly increased across Europe since 1990 and numbers in the UK appear to have increased in the same period. The current population in Europe is estimated to be about 600,000-1,600,000 breeding pairs. Source: Collins Bird Guide and Wikipedia.