@Benjamin *****
No I didn’t, at that point I pulled out all my other proofs. That Irish PAYE return was clearly absolute bs but they kept insisting on one despite me telling them. Then they got someone else to look over all my documents and proofs and eventually I got the extension. They were very interested in the bank book showing FTT transfers, something which seems likely is no longer available. This is why I just want to produce the letter and to confirm that it is still a viable way to get the extension in my case.