Thanks for the answer , but as originally stated I am not tax resident in theUK, ( I live and run a business in HK) Could you let me know if this has further implications?
If you are a UK national, it makes no difference. I would have mentioned your residency status if it did. If you aren't a UK national, then only your UK estate would be liable to IHT in the UK. If as a non-UK national, you make the payments to your parents from funds held abroad, then IHT won't be an issue in any event.