Only parts of the William Roy Building (Central Block) had a lower ground (LG) floor. This was mainly occupied by the subways and a few small plant rooms.
The WRB lower ground (LG) floor was mainly a subway that connected the Restaurant, A, B C and D (Compass House) cores (although access to D core was blocked off as of the late 1990s) with an additional subway going from B core via K core to F core in West Block. Additionally, there were small plant rooms off the subway; these housed pumps, calorifiers and other such small plant and the main heating pipes serving the building went through the subway. It was always very hot down there! The idea of the subway was to allow staff to access North Block and the Restaurant without having to go outside (useful when it was raining!). It was also useful for moving goods around the building without having to go through offices.
Subway facing from A core towards Compass House 
A Core lift lobby, LG floor 
Boiler House
The engine room of the site, this area provided heating for the entire Maybush complex.
Plant attendant suite
A suite of rooms containing workshops and WCs for maintenance staff, originally referred to as ‘Stokers’ Lavs’
LG floor maintenance workshop by F door 
BMS PC in Plant Attendant office by F door 
BMS PC in Plant Attendant office by F door 
Maintenance staff office by F Door turnstile
B core sprinkler pump room
Plant room opposite B lift containing sprinkler pumps and horizontal calorifier (hot water tank with heating coil) for industrial hot water.
Gary Tull enters the Sprinkler Pump Room at B core 
Hot water pumps in the B Core sprinkler pump plant room 
Vacuum pumps in B Core sprinkler pump room 
Pump control panel in the B core sprinkler plant room 
Vacuum pumps in B Core sprinkler pump room 
Control panels in the B core sprinkler plant room 
Calorifier in the B Core sprinkler pump plant room 
Hot water tank (calorifier) in B core Sprinkler Pump Room
B core calorifier room
Plant room by B core off subway between B and C core containing calorifiers/pipes/pumps for A, B and C core toilets and kitchettes.
Ducts
Two ducts ran from K core to E core and H core; these were just about high enough to stand in and supplied hot water from the Boiler House to E and H core.
Heating pipes from underground duct to E core 
Electricity cables beneath E core 
Duct below H core 
Duct at LG floor level between H core and K core 
Underground duct from E core to the Boiler House 
Underground duct leading from E core to the Boiler House.
Staff Restaurant – LG floor
This area is technically part of the Staff Restaurant but as it contained equipment serving the whole site then it is included here. In future this may warrant a separate page.
Subway and lift to Staff Restaurant 
LG floor turnstiles leading to the Staff Restaurant. 
Gas meter for the Staff Restaurant
Water booster pump room
This room contained the incoming water main and sprinkler pumps, water booster pumps and water treatment equipment.
Mains water booster pump water softening system 
Sprinkler pump control panel below the Restaurant. 
Control panel for Water booster pumps 
One of the two mains water booster pumps below the Restaurant 
One of the two mains water booster pumps below the Restaurant 
Mains water booster pumps, below the Restaurant 
Sprinkler pumps below the Restaurant
Calorifer room
This room contained all the plant for the Staff Restaurant, including domestic hot water calorifier/pumps and electrical switchgear.
Last updated on Wednesday 17 February 2021 by GaryReggae