I don't know how subtle the software is: can it be programmed to reject tickets at certain times, or purchased form certain locations? It will also vary station to station and between different train operating companies.
Its always Exeter St Davids and Central (FGW and always brought from TVP ) its very odd
Your Lucky, staff at Three Bridges didn't know what one was when I went there and nearly didn't let me back in.
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If it's any consolation, every East Midlands Trains barrier rejected my East Midlands Rover last year. Frustrating.