A query for the OP, are you referring to the June 1981 timetable with the above trains?
I'm asking as I've got the Section CL WTT for May 1980 and the trains in the timetable are:
7E13 06:45 Severn Tunnel Jn to Tinsley with the same routing as saltleyman quoted
8E16 09:30 Bescot...
There was a 1D17 13:00 Llandudno - Nottingham (arr 17:28) in the May 1980 timetable and a 1D17 12:33 Llandudno - Nottingham (arr 16:36) in the May 1982 timetable. Obviously slightly outside the 1970's.