I hadn't heard of the Little Bridges series till I was down at a meeting of cachers in Wiltshire last week, where I was persuaded to help migrate the series up to Cheshire. So, alongside GC5W356 (Iddenshall Rough) and GC5W75E (Antrobus), these are the first of their kind in the county.
Hopefully you should have no trouble locating the bridge, and the cache hidden nearby. Beware of the electric fences though!
I recommend that you park by the church in Tarvin.
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 is starting to spread fast. There is a stats listing run by Bloodsock, so you can see how many Little Bridges you have found, you can find it here:- https://littlebridgesseries.wordpress.com/. If you would like to add to the series, please contact Stan on stanthews@aol.com and he will give you a number for your bridge, 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.