Please sign what you find. This cache is part of an unnumbered series of caches called flagged up and is all about flags as you may have guessed if you have found any of the others.
The cache you are looking for is the Tonga flag and is a small cache. It is hidden quite well and you will need to leave the footpath to find it. Gloves might be a good idea and appropriate footwear as it does get very wet and muddy.
There are lots of dog walkers and cycylists up and down this path.
Please cache with your safety and your families safety in mind and protect yourselves so that you stay healthy.