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Good afternoon, if you hold ILR in the U.K. you would need to apply for a returning resident visa.
You need a Returning Resident visa to come back to live in the UK if you were previously settled (given ‘indefinite leave to enter or remain’) and you’ve been away for more than 2 years.
If you’ve been away for less than 2 years but you’ve lost your documentation, you can get a replacement BRP visa.
You may still need to apply for a visa if you’ve been asked to confirm you can travel to the UK, for example by the airline you’re travelling with.
Please see link with guidance on returning resident visa
When you receive the visa you would have 28 days to enter the U.K. from date you receive the returning resident visa.
As soon as you have obtained the visa you are free to travel as long as you have the intention to live in the U.K.
The 90 days per year rule is that if planning to naturalise as British citizen you should not be outside the U.K. for 90 days.
So once you have entered the U.K. and collected brp there are no restrictions on travel.
I would say you are likely to receive the returning resident visa on the grounds that your children and partner are British therefore that is sufficient to continue your family life in U.K.
Glad to be of assistance today. Kind regards