Overseas granted and vested ESOP turned NSO exercised after I became UK tax resident

Dear HMRC Team In 2017/2018 I was working for an UK company’s branch overseas, while being tax resident there as well. During the time, I was granted ESOPs by said overseas branch. The ESOP was about the UK company. The company had its IPO in mid 2022, when I was still tax resident overseas and the grant fully vested. At the IPO time, the ESOP were split into NSO. I moved to UK in late 2022 and I am a UK tax resident now (on skilled work visa). I exercised the NSO in 2024 and paid tax as per overseas laws of that country (which has double taxation treaties with the UK). The proceeds of the NSO trade (option > cash in a single transaction, therefore I never held shares nor had capital gains) were paid into my UK’s current account (way over any allowance, but less than my yearly income) Please clarify what kind of tax I owe in the UK; 1. Is it income tax? (the difference between exercise price and strike price - using overseas paid tax as tax credit) 2. Is it no tax, as I paid tax overseas already and the grant is binding to an overseas entity during a time I was also overseas? 3. Is it something else? If tax is due, how to work out the amount, payment deadlines and ways to declare via self assessment? Thank you

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