A recent set of TfGMC sub-committee minutes indicated that the Off-Peak ticket restrictions on Northern would apply from 1600 to 1830 but does anyone have any further details?
I overheard a guard explaining evening peak restrictions on a duo ticket the other day - I might be wrong but I can't recall these existing previously. I presume duos are an unregulated product - therefore allowing immediate imposition if evening peak restrictions?
A little bit of research suggests that duos into/out of major cities now carry an evening restriction of "not valid between 1601-1759". Presumably this gives a good indication of what Northern intend for September?