If I lived in England, I know where I would be on June 25th, 2011.  I'd be at the Bovington Tank Museum in Dorset.  They bill the place as the world's largest tank museum and  might be right, and they've got some pretty rare machines too.  During regular days the machine hosts plenty of exhibitions, and even tank rides,  but this June is Tankfest.   This 2 day festival will include British Army demonstrations, and late model gear, combat demonstrations and, in a nod towards the ongoing operations in Libya, a mock battle set in 1943 Tunisia.   Some big iron will be there, Tiger tanks, and a rare British assault gun developed towards the end of WW2, the 78 ton Tortoise.

The following video is from Wonkarar007's channel and shows Tankfest 2008.