Everyone’s talking about about Sheku Kanneh-Mason, the young British cellist from Nottingham who astonished the world at the royal wedding, and whose 2018 debut CD stormed the US pop charts. He’s every bit as charismatic in real life, and yes – the rest of his family is just as gifted too. Today, Kanneh-Mason and his sister Isata play the music closest to their hearts: a very personal encounter with a life-affirming talent