These locked gates mark the far boundary of Hylands Park. An old original wooden gate post is still in existence but now holding up the fence; it is quite an important post for this cache. You are looking for a camouflaged container and will need to bring a pen and tweezers (something has been left to help if you forget the tweezers, but who knows how long it will last). Chelmsford City Council has introduced car parking charges for Hylands Park; please go to https://www.chelmsford.gov.uk/parking-and-travel/hylands-car-parks/ for details.
From here you can continue to the last cache of this series; head back to the car park across the lovely less populated grounds of the park, perhaps stopping at Middle of the Park cache on the way.