From 6 April 2025 UK IHT is no longer based on domicile but residence, Anyone with a UK domicile of origin will escape UK IHT on non UK assets after you have ceased to be UK tax resident for 10 years.
The one downside is that if your spouse is still liable to IHT you don’t get the automatic spousal exemption just a £325k spousal allowance if they die first. You can opt for the unlimited exemption but that puts you back into having an IHT liability.