Abstract The Cetti’s Warbler Cettia cetti is a relatively recent colonist in Britain, with breeding first confirmed in 1973. Since then, the species has gradually spread northwards. Northern England and southern Scotland are now at the frontier of the species’ advance, with Cetti’s Warbler first recorded in Cumbria in 2005 and first proven breeding in 2023. The Cumbrian population is no

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