Development authorised by the High Speed Rail (London-West Midlands) Act 2017 relating to; a vent shaft headhouse building with a footprint of 58m x 29m, comprising three principle connected headhouse elements (mechanical and electrical plant building, fan room and ventilation stacks) and access stairs located adjacent to the building. Road vehicle parking within the compound with a hardstanding area of approximately 820m2. Earthworks within the compound area for the headhouse building and associated hardstanding area, regrading and extension of existing access road, gabion walls for ecological enhancement with a slight retaining function, a flood defence wall with a slight retaining function, a retaining wall on the northeast site boundary, and retaining walls adjacent to the access stairs on the embankment. Security fencing encircling the headhouse building, boundary fencing along the private access road and area of ecological mitigation, vehicle barrier adjacent to the south side of the access road, and guard rails adjacent to the access stairs. Artificial lighting equipment at the compound entrance, affixed to the headhouse building and walls, and pole mounted within the compound