non-resident CGT applicability on UK joint shares account

If I am a non UK tax resident for more than 5 years but jointly own UK shares in a UK investment account with a sibling who remains a UK tax resident, am I liable for CGT on my 50% interest in any capital gains upon liquidation of the account? My understanding is that we are each responsible for our respective CGT on our 50% shares such that I have no UK CGT liability but he will as a UK tax resident. Thank you.

Hi 
You would need to consult the tax treaty with your country of residence, to ensure that the capital gain is covered.  
Guidance is available at: Tax treaties 
If the treaty gives your country of residence the right to tax your gain, you would not have to pay any capital gains in the UK.  As a UK resident, your brother would have CGT to pay.
Thank you