This cache is not at the location stated - it just requires you to solve a small puzzle and look up a date to solve the final resting place of where this cats is hiding.
You need to find out the date - eg month and the year of when the Premiere of the musical CATS was first shown in the UK
A = month B = year 11-0A-19B1
when you have found the answers to A and B you will be able to work out the coorinates.
N = 051 44 0BA
W = 004 37 B0A