The late journalist David Frost, pictured, was famously married to a Catholic – the Duke of Norfolk’s daughter Lady Carina, now his widow – but according to a new biography, some of his family members were less familiar with some aspects of the Church.In the book, Neil Hegarty describes how, after the 1983 church blessing for David and Carina that followed a ceremony at Chelsea register office, Frost’s mother Mona wanted to put a £5 note into the poor box. She foun