There's already a tour of the Mark V* on the net, but this is newer and better. Robert Cogan is very talkative and explains not just the mechanics but also the service history, some of which was completely new to me. Don't worry about the woman who appears at the beginning; she's a female tank nerd.
"Sometimes things that are not true are included in Wikipedia. While at first glance that may appear like a very great problem for Wikipedia, in reality is it not. In fact, it's a good thing." - Wikipedia.