Antiques Roadshow expert Mark Smith was left emotional after one guest brought back a piece of his father’s RAF heritage – learning more about the hard times in his life. RAF boots and photos were laid on the table where Smith explained: “We met at a talk, some months ago and I do have to say that I think we both stopped in our tracks that night didn’t we.” The guest continued: “I found in a pair of flight boots that I bought many years ago with a letter which sparked me on a 20-year quest to find out all about the man in the letter, his family and what happened to him. “I brought the letter u…