Bearded dragon missing, sandy with dark bands

I lost my bearded dragon, Sunny, yesterday around 3pm. He's about 20 cm long from nose to tail, sandy beige with darker brown bands along his back. He has a small chipped scale on his right hind leg and a faint orange spot just under his chin. I last saw him outside the entrance to Leeds city center's Corn Exchange on Briggate, but he might have wandered into a nearby alley toward Mill Hill. He’s a friendly little guy and means a lot to me—this is really worrying, my daughter adores him and I just want to bring him home.