The given coordinates for this cache are in the car park for the Jubilee Country Park, which contains a geocache series that I put out to coincide with the visit of Queen Elizabeth II to Bromley during her Diamond Jubilee celebrations.
QE is also used in the name or abbreviation applied to several things:
- Queen of England
- a number of schools, hospitals, named after the Queen
- an album by Mike Oldfield, "QE2"
- transatlantic liners, QE and QE2 now retired
- a class of aircraft carriers
- IATA airline designator for Crossair Europe
- Quantum Economics, a type of monetary economic analysis
- Quantum Efficiency, a measure of a detector's reaction to light
- Queen Elizabeth Way, a highway in Canada
- QE2 Bridge, over the Thames at Dartford
- as part of the name of some asteroids
The cache, a magnetic nano tube, is not located at the given coordinates but at the location given by the formula below:
N 51 23.(B*B) A (3*C) E 0 3.B (B*B-C) (A*B)
Where A = November 2010 , B = September 2012 and C = November 2008
I hope you find the cache Quite Easy.
You can check your answer here 
gps at the final location is not good - you would do well to take note of the hint.