The boundary dividing the parish of Wexham referred to in Part II of this Schedule shall be such as the Secretary of State may by order determine on or near the general line of the northern and eastern boundaries of Wexham Hospital, Wexham Park Lane, the eastern and southern boundaries of Ordnance Survey parcels 49, 48a, 31, 32, 33, 15, 14 and 13, Church Lane and Uxbridge Road south-westwards from Church Lane.