Yes, I was successful in reclaiming 2012-13, 13-14 and 14-15 earlier this year. I don't know what has changed since I applied on 25 Apr this year. Even if a further year would have gone out of date since, you should still be alright for '13-14 if I was alright for '12-13 half a year ago....
I wrote to HMRC and gave all the information and was shocked when they said they cannot refund 2013-14 year as that year is out of date. How could I make a claim on time when I was unaware that tax was being wrongly deducted in the first place? How can they refuse to repay tax that was wrongly deducted by them and paid by me in good faith? Error or Mistake Relief has apparently been replaced by Overpayment Relief and I will apply under that for the 2014-15 and 2015-16 years.
I was wondering if you were successful in recovering tax paid for out of date years and if so under which provision this was done. This would be very helpful.
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Sorry not to be able to help any further.