@Adeydee95 , it's been a fairly slow process starting back in March and I'm probably not going to get it before the new year.
I found it helpful to look a the criteria listed on INPUT's website and 'make' my experiences match them, writing down my arguments on sheets of paper as bullet points (even revising the notes and writing them out again to cut back on waffling).
I pushed the quality of life angle - excessive number of injections to maintain good control and the effect that had on me, and having too many hypos. It looks like I've managed to tick enough boxes to qualify, something that I thought would be a bit of a battle as my HbA1c is reasonably good.