It shouldn't matter, probably, BUT, the biggest issues in applications come up with the PCC. 7 year old PCC sounds a bit much tbh
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The problem with PCCs becomes that if they think there is a problem, there is usually a straight up rejection. To avoid any chance of that, i would avoid furnishing anything that seems like it was printed in another lifetime. I think the 6 month validity criteria is there because they want fresh evidence. But you can take a call and go ahead with using what you have. You don't have any issues in the dates, all your dates are covered.