HKDC wrote: .... My wife is Chinese nationality/ HK resident.
.... I now have concern that I have rather unwittingly burdened my wife with potentially a huge IHT should I die unexpectedly. Thanks for your advice.
To expand on Maths' comments, specific advice can only follow on from a very detailed examination of your past, current and future planned circumstances as well as any UK/HK estate duty double taxation agreement (of which I have no knowledge nor do I of HK estate duty legislation). From a historical viewpoint, you don’t say whether you were born legitimately to a UK domiciled father, and so took on his domicile as your domicile of origin; whether you have only lived in HK in the last 16 years and frequency of visits to UK; when you reduced your ties to UK to one bank account with a nominal amount in it and for what reason(s) you have retained that account. As regards the future, do you plan to remain living in HK for the remainder of your life and have you done anything to demonstrate that - buying a funeral plan/plot seems to be a favourite such demonstration.
But from what you have written it seems more likely than not that you have established a domicile of choice in HK as far as HMRC in UK will be concerned. You have clearly severed virtually all historical ties to UK (possibly you could move that account offshore to Isle of Man and/or put it in joint names with right of survivorship) more than three years ago and all you can do to improve your claim to be non-domiciled in UK/domiciled in HK is to demonstrate your future ties to HK. On your death, if your assets, your will and the administration of your death estate are all located in HK then it will be hard for HMRC to prosecute any claim for you to be UK domiciled even in the unlikelihood if they had a case under UK legislation - but DTA should address that.
I’d suggest you find a member of STEP resident in HK who has knowledge of both UK and HK legislation to speak to about your detailed circumstances so to give you and your wife specific advice and peace of mind. Such a person can be found via STEP website at:
http://www.step.org/system_pages/call_to_action_navigation/search_for_a_step_member/member_search_results.aspx