Capital Gains Tax after selling off stocks in other country

I bought some shares from a broker few years ago, in Hong Kong. last year I became a UK resident, I intend to sell off my stocks and transferring the money (possibly with realised gains from stocks) to my UK account. Do this trigger capital gains tax? Do I need to self declare to HMRC on anything? Also, what if when I selling off my stocks, I was losing money(no capital gains), would the procedures be different? Thank you

Hi Marco,
Yes you will need to report the gain as you are transferring the funds.
Thank you.