Well!Well!
That's interesting. I posted a message some weeks ago about this. I had an instructor at the old Bailbrook College, (now closed), who had been an instructor at Colerne in 1945 and he told me he had seen a number of Miles Master aircraft taxied into a pit which had been dug on the airfield and then buried. Sorry! I know no more. Can't even remember the chaps name as it was some time ago! But you may be interested to hear this 'rumour' from another source. I should be very surprised if there's anything left worth digging up after this time and the weight of the soil etc.
Spiney