BRITAIN'S Queen Elizabeth is the most popular member of the royal family and more than half her subjects want her to reign for the rest of her life, a poll ahead of her 80th birthday suggested today. Some 26 per cent of respondents plumped for the monarch - who turns 80 on Saturday - as their favourite royal compared to just one per cent for Camilla, the second wife of Prince Charles, the Queen's eldest son and heir apparent. Prince William, 23, second in line to the throne and Charles' elder son, was second with 21 per cent followed by...