Plan of second floor ductwork layout, dated 17/07/1991. Drawn by 'PJS' at Air Circulation & Design Ltd.

A1 plan for 'Mechanical Services Provisions New Hall 2nd Floor'. Drawn by 'GJW' at Austin-Smith: Lord and fated April 1991.

Existing layout of tankroom and proposed layout of tankroom, with schedule of works to be undertaken. Dated July 1991.

Plan of third floor air conditioning control panel, dated July 1991. Drawn by 'M.P.' at Air Circulation & Design Ltd.

Plan of third floor ductwork layout, dated June 1991. Drawn by 'PJS' at Air Circulation & Design Ltd.

A1 1:20 scale plan for toilet cubicles. Dated 'July', with damage to corner obscuring year.