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I pray this is not correct. So many things in life depend on 'residency' status -- mortgages, accounts with banks, employment, taxes, etc.You are not considered resident until the ILR approval.
Entitlement to use the NHS because of employment here? That is detailed on :-You are eligible for a Form E111 if you are ordinarily resident in the UK.
The E111 arrangements apply to stateless persons and refugees resident in the UK. They now also generally apply to Non-EEA nationals lawfully resident in the UK. They do NOT apply to Non-EEA nationals for visits to Denmark, Iceland, Liechtenstein, Norway or Switzerland and private insurance should be obtained. However, Non-EEA nationals visiting Iceland are covered for emergency treatment only under a reciprocal health care agreement between the UK and Iceland. You will need to produce your NHS medical card to get treatment.