Have we reached peak Costa Coffee?

The high-street chain has dominated the UK’s £9.6bn coffee market for years – but sales fell last year for the first time. Does competition from independents mean trouble is brewing?It was voted the nation’s favourite coffee shop for the eighth year running in 2017 and this week announced its latest branch: on the cobbles of Coronation Street in a groundbreaking product placement deal. Yet earlier this month, Costa Coffee announced that its sales dipped by 1.5% in the thi