Trafalgar Square’s St Martin-in-the-Fields gives up secrets of its stones

Church marks 300 years with exhibition and online archive telling of UK’s first Black voters, and history of compassion and protestFrom a family of chimney sweeps including one of Britain’s two earliest documented Black voters, to the mystery of a 19-year-old youth believed enslaved, St Martin-in-the-Fields church on Trafalgar Square still has secrets to share as it marks its 300th anniversary.Standing at the heart …