This cache is an easy to work out but harder to locate and retrieved 2 stage multi.
It is placed along the public footpath that runs parallel with the A316 and down the middle of Kempton Park Water Works / Steam Museum.
At the posted coordinates you will find 2 sets of numbers ABCDE and FG use these to work out the final.
A+B = H
N51°25.(((A+B)*F)+A)(H*F)(A+B+H)
W000°24.H(F+A)E
At the final you may need some special equipment.