Prince Andrew is secretly helping Prince Edward ahead of his debut at a major event, sources have claimed. The Duke of Edinburgh is set to appear at Trooping the Colour on horseback, as opposed to in a carriage like he did in previous years. Prince Edward, 60, and his wife Sophie, Duchess of Edinburgh, 59, will both be attending the ceremony to support King Charles III. This will be the monarch’s second Trooping the Colour of his reign, but his first since announcing he was diagnosed with cancer. Earlier this year, the Duke of Edinburgh was appointed the new colonel of the Scots Guards. He too…