For reasons that weren't exactly clear to me, IWM Duxford, "The world's premier aviation museum," has an entire building dedicated to armor and ground warfare. I'm guessing that costs allowed an extensive, interesting display, while other IWM locations would be prohibitive.
The Land Warfare Hall is impressive. It's huge, it's enormously detailed, and it's very interesting. I wish I had more time, but even with four hours, it's not enough time to catch everything. The museum was closing as I reached the Land Warfare Hall, so I only took a few pictures. I didn't use a flash, and it's very dark, so I apologize for the low light levels of some of the pictures.