East Merstham Mobilisation Centre, also known as Alderstead Fort, is one of a line of 13 fortifications built for the defence of London at the end of the 19th Century and beginning of the 20th Century. They stretch from North Weald in Essex to Guildford, most being located high up on the Surrey downs, and varied in form. They were basically a row of casemates, which were the ordnance stores, with surrounding earthworks and a fortified entrance. The fort at East Merstham is little altered, but is now in a wooded area and largely overgown. The casemates are in good condition, with doors remaining and a number of stencilled signs above doorways. Unfortunately, there is water ingress and the shell stores and their lighting passages were too flooded to enter when visited.
This site is private land, many thanks to the owner for allowing me to visit.
Left flank loopholed wall
Metal door into
Right flank loopholed wall