I'm sorry but you cannot expect everyone to know the ins and outs of ticketing (especially with an obscure ticket like that)
I have some minor simpathy for this view. If you think it's hard for staff, then how is the average passenger supposed to know! The issue here was FGW said they trained their staff at Paddington on this specific ticket, so obscure or not the staff should have known about the detail of it. The reason it happened again suggested that training has not taken place (in which case FGW lied) or training has taken place and staff wilfully and knowingly continue to flout ticket validity riles and instructions from their management.
I assume you were rude to him as well as it sounds like you were from the fact you've called him a muppet on here.
What's the basis for this assumption?
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But if the ticket says off peak, has no restriction code and he's trying to travel at peak what do you expect?
Peak is defined by the ticket, not whatever time a member of staff thinks it is. In other words what is off peak for one ticket might not be for another. So the passenger was travelling at off peak times. This is a basic ticketing principle which staff should know, even if they don't know the specifics of the actual restriction code.
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Exactly, so don't go out of your way to get tickets printed with avantix machines from Didcot (so then you get the restriction code).
Simple.
The ticket held was valid. Where it came from, what machine it was printed with, or whether or not it had a restriction code printed on it is totally relevant here. Simple.