Physical cache is not at listed coordinates. They will take you to the building you need to solve the equation.
Great Blakenham Baptist Church is a small but popular and well-established place of worship that will soon be celebrating its 150-year anniversary.
Near the top of the building you will see a plaque containing a year when Queen Victoria was on the throne: WXYZ.
Physical cache is hidden at:
N 52. 06. (Wx5), (Y-Y), (W+X)
E 001. 06. (W+W), (W+Y), (W+W+Z)