Behind hoardings on Clapham High Street SW 4 at its junction with Carpenters Place. A circular concrete ‘pillbox’ with a square brick intake ventilation shaft on the roof. There are brick extensions on either side for the original entrance doors and a new rectangular brick extension with loading bay at the rear. There is a separate square brick ventilation shaft in the compound behind the ‘pillbox’.
Behind hoardings at the junction of Clapham High Street and Clapham Park Road, SW 4. A roughly figure of 8 shaped concrete ‘pillbox’ with a square brick intake ventilation shaft on the roof and a 2nd brick ventilation shaft and entrance adjoined to the rear. Beside this is a small brick extension with a door. This entrance appears not to be uses other than for emergency access.