Work No. 18AA—U.K.A railway (1,700 metres in length) commencing by a junction with the railway (Work No. 18A) at its termination, passing eastwards over the M20 and the A20 and an access road within the Channel Tunnel Terminal and terminating by a junction with the Eurotunnel Railway at a point 1,430 metres east of the western end of the bridge carrying that railway over the A20, including bridges over the M20, the A20 and the said access road;