Work No. 4G—U.K.A passenger subway, including a lift shaft, commencing by a junction with the cross-passage (Work No. 4Q), passing eastwards to junctions with the cross-passage (Work No. 4R) and with the passenger subway (Work No. 4F) at its termination, and terminating by a junction with the existing cross-passage between northbound and southbound station tunnels of the Northern Line beneath a point 60 metres north-east of the existing junction of Pancras Road with Euston Road;