Hi Sam,
I would normally look at the evidence being ideal no more then 12 months old, however I understand that this is not always practical. JCQ are normally ok with it being slightly older, if you have then been giving 50% extra time as standard practice and can evidence this over the period of time. I would always double check with JCQ though – they are really helpful over the phone and always best to make sure that you have the right evidence for your exam board as it always changes and some assessors are tighter then others. Do you have an examinations officer and a JCQ link?
Kate