This is one of a line of 21 surviving milestones along the former Norwich to Thetford turnpike, created in its entirety in 1766 and lasting until 1870. More details on this milestone can be found on the Norfolk Heritage Explorer. If possible I will try and place caches near as many of these milestones as possible, although as I know a few are beside the main A11 I may have to get inventive to make the caches accessible!
This one seems to have popped into the pub it is next to, which is a popular venue for Caching events!
The given coordinates are for the milestone, but the cache is not there. Solve the puzzle of what I felt was an appropriate picture via the link below to obtain the final coordinates. It is suggested that you create an account on the puzzle page if you haven't already, to avoid losing any progress.