Queen Elizabeth was “certainly not quite mad” before her death, a royal expert has insisted. Royal biographer Margaret Holder made the remark in the wake of the row that has erupted after ‘Lord of the Rings’ actor Sir McKellen, 85, made a string of digs at the Royal Family – including branding Prince Harry dim and Queen Elizabeth “quite mad” and “rude”. She told the Daily Express as calls grow for the star to hand back his knighthood: “Her Majesty the Queen was certainly not ‘quite mad’. “Most people from staff to politicians say she was mentally sharp to the end of her life. “As for her being…