By reason of its location significantly above garden level, the proposed glazed infill extension is considered to introduce an alien feature at this level, removing an original window and having an overbearing impact on the rear facade. This would be detrimental to the special architectural character and historic interest of the property, the terrace of which it forms part, and the character and appearance of the surrounding Conservation Area and would be contrary to policies contained within the Conservation and Development Chapter of the Unitary Development Plan, particularly Policies CD25, CD41, CD42, CD48, CD52, CD53 and CD58.