Don't think so. The key to cheap advance tickets is committing to travel on a specific timed train. What I do is buy advance tickets online, then immediately go and pick the tickets up from my local station's ticket machine.
Yeah that's what I'd been attempting.
It's for travel at the end of this month. I'd found the cheap advance tickets I wanted, at the specific travel times, but the online payment has failed on the four times I've tried since last Sunday
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Anyway I've called in at the station this afternoon and purchased the exact same advance tickets over the counter at the same price as offered online. Result