If you're going to take a tour in York, let it be with Christopher. My adult son and I just spent a fantastic day learning the history of York with him. We went into nooks and crannies and Snickleways we never would have found on our own. We started at York Minster, then covered a ton of ground. Pre-tour he was very responsive to inquiries, and will tailor an itinerary to your liking - or, if you want him to just let loose and show you the city he loves, he'll do that too. If you love history, and totally appreciate someone who is just as, or more geeky than you about the subject, he's your man. He knows just about everything you could ever imagine about York, and is hilarious, kind, and can tell a story like no one else. It was a day more than well spent.