There was a big clear up on Salisbury Plain about 20 years ago, removing most if not all WW2 armour that had been used as hard targets. I saw heaps of shot up vehicles in Shanleys scrap yard in Trowbridge including the remains of WW2 German half tracks, I was told that the 'good stuff' was in their other yard at Warminster but I never got round to checking it out, remember this was over 20 years ago and their is nothing of interest left in either of their yards.
An elderly chap that lives at the end of our road was chatting to me a couple of years ago and mentioned that when he was stationed at Warminster in the 1950s he was detailed to go to the railhead ( just behind where I work now) and help in offloading a full train load of Comet tanks, these were unused, they were refuelled then driven on to the Plain as hard targets!!!
I have been told by current and ex employees of where I work that there are still buried tanks on the Plain, including the Sherman DD that I mentioned on this post a few years ago, it was discovered when a new trench system was been dug, then reburied. Apparently there is one of the Tortoise tanks buried in preserved condition behind Imber Clump, and a load of WW2 scrap under the hard standings at work.
As all these are on active MoD property there is absolutely no chance of getting permission to dig up any of these.