The best I could find was a statement "2 kilometers NNW of Cricklade".
Could find no actual accident report but came up with the following.
1963 | 1903 | Flight Archive
1963 | 1904 | Flight Archive
1963 | 1939 | Flight Archive
1965 | 1977 | Flight Archive
1965 | 1978 | Flight Archive
You may also be interested in the belly landing of G-ASJD on Salisbury Plain during stall tests.
capt masland | flight international | sayen award | 1965 | 0946 | Flight Archive
Edited to add: yes, Cratt Hill.