This cache has been placed to celebrate a certain milestone birthday for one of the Puzzle Club members.
The two letter cache title may also help anyone wanting to qualify for GC53YET The 21 Character Challenge
The cache is NOT at the given co-ords which are on a busy roundabout so please do not try to go there!
The following all have something in common but to solve the puzzle you need to sort out another thing about them.
The cache may then be found at:
N 51 A D . (B + C) (F – D – A) E
W 000 F D . (E + F) D (C - B)
You can check your answers for this puzzle on GeoChecker.com.
Following replacement in April 2016 the final co-ords have changed slightly but rather than change the formula and GeoChecker please now add 0.005 to the Northings and add 0.001 to the Westings.
If approaching from the south it may be best to park up and walk the last 300 feet and take great care especially if you have children or dogs with you.
Congratulations to ===sgb on FTF.