Is the London Terminals to Manchester off peak return, still valid via Sheffield? Just have not used it for a while, so wanted check can still use Sheffield to St Pancras, and what are the other valid routes? Have looked at the routing guide,, but its so long winded and confusing, its not clear where valid via, as the codes are not usual 3 letter codes used in timetables etc. seem to have to use maps which long winded, is there easy way to use routing guide? Thanks