I remember watching Stan Cummins as a lad from the terraces in the early 80's. 
So to the cache location .... N54 31.ABC W001 31.DEF
A = 66,000 engines were produced here in 202A
B = How many letters in the name of this place
CD = 15CD are employed here
E = How many goals did Stan Cummins score for Crystal Palace
F = January 2022, milestone of producing it's 1,5FF,FFF'th engine at Darlngton