Unmarried Partner Visa - Sponsor leaving UK permanently

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Hi

I am a British Citizen and my partner has an unmarried partner visa. We are both living and working in the UK. However, we are permanently relocating to Hong Kong. My partner's employment contract has a 3 month notice period. I am required to permanently move to Hong Kong as soon as possible. From the time I leave, I have no plans to return to the UK. Because of my partner's notice period, she will be living and working in the UK for 3 months on her own (assuming she is unable to negotiate to reduce the period). From the time I leave the UK, we have no intention of living together permanently in the UK - which is a condition of the visa.

If she complied with her employment contract and worked the notice period, would this not be a breach of the Immigration Rules? Is it correct that an English court would not enforce the notice period as this would be contrary to the Immigration Rules?

My partner does not actually want to live in the UK on her own for such a long period and would like to join me in Hong Kong as soon as possible - so this could actually be a helpful set of circumstances. I spoke to the Home Office who couldn't answer my question and directed me to write a letter to the curtailment team.

Wondering if anyone else has had a similar set of circumstances?

Many thanks!