As part of a big group, perhaps 25, we had a very interesting ghost talk/walk around the centre of York. We all gathered round at each stop and the guide made sure we could all see and hear. About 1 and a half hours for the tour was enough time to hear lots of stories and not be too tiring. Believe or not there was plenty to make you think. At £5 for adults and £3 for Seniors I think this was good value. Tours go at 8pm every evening. Highly recommended.