Not quite up to date. If you return to permanent residence (not just on a visit home) your NHS cover is effective immediately. Nor do I think the '9 months ' is correct
How does a hospital/doctor know if you have been out of the UK ? unless you tell them. Asking for a friend.
And immigration is a forking nuisance and too intrusive. having home visit today (11.30), not only do they want our witness to be present, they want a fourth person ! for more photos !