Leisurely Walks – Parkgate – Step in Stone Traditional Cache

This cache is one of several I have hidden on a circular walk around Parkgate. You can do this cache on its own, or as part of the complete circular walk, information about the walk can be found in “Leisurely Walks – Parkgate – The Walk”

Each cache that makes up the complete walk has a set of letters and numbers, which you need to insert into a formula to enable you to find the location of the final cache in the series “Leisurely Walks – Parkgate – The Walk”