The third of the "1" series. (See also 1-1-11, 11-1-11 and 11-11-11)
Park at N 51° 49.574' E 0° 41.272' (close to cache 11-1-11) and walk along the slip road and then the A12. It will be noisy, but there is a pedestrian walkway for the complete length. At Hole Farm turn SSW to join the signposted footpath that leads to the quiet area of the cache.