You are looking for a very small circular container. You may be surPRISEd to find where this cache is. You may also need something like a couple of thin sticks or pencils to retrieve the container itself as it can be difficult to get out.
From here, follow the waymarkers across the field and walk straight down the side of the next field (by the pavilion). On reaching the road, follow the pavement left until the right turn (Mill Lane). Go down Mill Lane until you get to the 'Welcome to Gilmorton' sign. This is the location of #8.
Congratulations to Bazhornet for FTF 