This is an offset multi-cache in Bristol. The posted coordinates are virtual and bring you to a sign that talks about measures used to reduce polluted water in the area.
To obtain the cache coordinates, input the five letter acronym for what is constructed here. You can find this acronym in a few places on the sign, and it is in parenthesis each time. Some of these places include the third paragraph from the top or under the larger image near the bottom of the sign.
Once the acronym has been correctly input into Certitude, you will find the winter-friendly cache hanging nearby. Hope you enjoy.
You can validate your puzzle solution with
certitude.