Regulated fares - which usually means the Off-Peak Return on longer journeys - cannot have evening peak restrictions outside of the London area (the boundary is Stevenage, Luton, Watford Junction and Reading).So is that to say that travel that doesn't involve London in the evening will be fine on an off-peak ticket?
It appears I've definitely fallen for this one then! Feel very stupid now as I've always been a bit wary of using an off peak ticket on evening services.
There are, however, plenty of non-regulated Off-Peak fares which have evening peak restrictions, for example many Off-Peak Day Returns around large cities.
It's not as simple as saying there are either always or never any restrictions. You need to check the restriction code applying to the ticket in question.