Gains on investments made prior to moving to the UK

Greetings, I moved to the UK in December last year. I had made investments in stocks and ETFs prior to moving here which I now need to withdraw. I have updated all tax related documentation with the broker. For calculating capital gains, do I take the cost as the costs when I purchased the shares or costs on the day when I moved to the UK? Investments were moved by the broker to their UK entity upon my move here without any sale being made.

Hi,
It is the date you purchased them.
Thank you.