New single storey platform enclosure to boiler house upper roof (Level 6) and structural skeleton frame from ground level. Alterations to the east elevation of boiler house plant room at Level 2 to enlarge existing external wall opening. Demolition of existing Level 2 gantry platform and construction of new enlarged gantry platform. Proposed cantilevered extension to existing sampling room enclosure at Level 5. New access stair from Level 5.

Installation of a 1.8m fencing on front perimeter of site and brick entrance pillars in existing site entrance, together with fitting of gates. construction of a garage front to side of house together with veranda roof to rear.

Non material amendment of planning permission 20/03949/REM (Approval of matters reserved for appearance, landscaping, layout, scale and tree protection following outline planning permission S/4331/18/OL for demolition of existing house and construction of 3 new houses) change the roof and first floor cladding material (currently shown as slate) to grey/black zinc standing seam.