This Little Bridge is best approached from the ring road cycle path via GC9QPT8 LB # 2454, but I have added 2 possible Parking Spots to access it from the footpath on the other side ... I've added a checker if you want to verify your coordinates..
At the headline coordinates count
The number of bridge boards =A
The number of rails on one side =B
The number of gates=C
The cache is at N51 25. (B+C) ((A/B)-C) ((A-B)/(B*C))
W2 30. ((B*C)+B)) ((A+C)/(B+C)) ((A+B)/(B*B))

You can validate your puzzle solution with certitude.
□□□□□□□Congratulations to thehumdingers for FTF□□□□□□

The Little Bridges series was started by Stanthews in 2009 to highlight small footbridges in remote parts of Wiltshire. Since then the series has been expanded by others all over the country and starting to spread fast. There is a stats listing, so you can see how many Little Bridges you have found, you can find it here: - https://www.littlebridgesseries.co.uk. If you would like to add to the series, please go to this site, on the tab Get Involved click number request and fill in the form. To qualify, the bridge must be a foot bridge too small for vehicles, please make sure your title exactly matches “Little Bridges # xxxx then the name” including spaces so it will get picked up and added to stats list.