Brick Kiln Lane (We used to call it 'The Donkey Side' (as distinct to the Riverside) as there was a donkey in the field that used to bray loudly at all passers by) is a popular walking route and one will find muggles and doggles at any time of the day. I am uncertain where the brick kilns were, but there were a number of small clay quarries around Hitchin which provided bricks for construction in the 19th century. There are some possible brick pits along Gosmore Road near the start of the lane. Although the lane is metalled along its length from Gosmore Road to Charlton, there is now no vehicular access, so one must park (if coming by car) near the old Windmill pub in Charlton, or somewhere in the Gosmore Road. From the former it is a short but steep walk to the GZ, passing a pretty thatched cottage on the right and some Mangolitsa pigs (sheep pigs) on the left. From latter, it is a longer walk, about 1km, to the GZ, with paths off to both sides. Either way, the surface is dry and one can reach the GZ on foot, bike, or horse.
The cache is a magnetic 2ml screw-top tube. Since there is no traffic, it is very safe for children. The area also can get quite nettley in summer/autumn. The main issue in retrieving will be the high muggle presence which can be a problem during daylight hours, and in all weathers