You shall need to fill in a crossword, then use the letters from the coloured boxes get the numbers to guide you to the final location.
Please be advised, the trip to GZ shall involve a bit of walking, and may not be suitable for wheelchair users, although strollers/pushchairs should be fine.
Across
1. RAF Lynehams "gate guardian".
6. Surname of RAF Lyneham's Station Commander 1985-1987
7. Plane that made a Flypast on 31st May 2011 during the closing parade.
8. This plane was associated with RAF Lyneham for decades.
10. Road the school is on.
Down
2. Married Quarters estate named for a local woods.
3. Lt General who originally proposed that Royal Air Force officers use a combination of British Army and Royal Navy ranks.
4. Month in 1940 when a single enemy aircraft attacked RAF Lyneham.
5. Road past the Station Commanders duck pond.
9. Month in between the closing ceremony and the last four planes leaving RAF Lyneham.
Once this is completed, you can use the answers to translate the final cache location:
N51 [1][2].[3][4][5]
W001 [6][7].[ 8][9][10]