It depends on the fare type.
If this is an "Advance" ticket – an inflexible ticket which requires you to travel on a specific train – then this is not, in theory, valid. There is, of course, the possibility of station staff taking pity on you, but it’s not something you should rely on.
If, on the other hand, you’re buying flexible tickets – (Super) Off-Peak or Anytime Singles or Returns – this would almost certainly be valid, but I’d have to know your destination to be sure (a few destinations have "break of journey" restrictions on the fare, specifically ones in North Wales).
Other things to consider:
Credit:stackoverflow.com‘
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