Stephen Morris, the drummer for Joy Division and New Order, owns a few tracked military vehicles, but I don’t think any are actual tanks. He’s in England, wonder how many bureaucratic hoops he had to jump through.
not strictly a tank because of its mission (i.e. it would do lousy in tank-to-tank combat), but more properly called an SPG or self-propelled field artillery.
http://www.bigissue.com/features/interviews/5105/new-order-drummer-stephen-morris-i-keep-a-tank-in-my-shed
here's what they look like: