Work No. 23C(1)—U.K.Diversion of the A13 (Arterial Road, Purfleet) commencing in that road at a point 360 metres west of its existing junction with Purfleet Bypass, passing eastwards by way of the northern junction roundabout forming part of Work No. 23C(2), and terminating in the A13 at a point 235 metres east of the said existing road junction;