hi
It might be worth researching the local county police war diaries, usually held in the county record office
or the civil defence war diaries, ( used to be in the taunton record office )
Or 67MU records at the NA kew, ( they were the south west recovery unit )
They usually give a more accurate site location, as the official card was usually vague on location, unless it gave the wartime grid map reference
Cheers
Jerry