Just spoke to HRMC to chase up eligible years and what I might need to pay.
The agent said ‘we haven’t received your response from July 2024’.
Then said ‘oh, yes we have’ (too late, ambulance called

)
Anyway… apparently the team is overwhelmed… their official line is that as long as you have *applied* by April you’ll be eligible, it doesn’t have to be finalised by then. They said they just can’t process everyone by the deadline.
Haven’t got that in writing, but they’re usually pretty fair on those sorts of things.