Paying UK tax on RSUs that vested while working in the US

I've worked in the US as a non-immigrant worker for the last 7 years. I have RSUs that vested during the time I've been a tax resident in the US. I am now returning to the UK permanently and I'm trying to understand the following: If I sell those vested RSUs after I moved back to the UK will I have to pay both US and UK tax on the capital gains?

Hi Amanda Waite,

If you are resident in the UK at the time of vesting, the RSU's will be taxable as interest in the UK and not the US.  
If you are resident in the US at the time of vesting, they will be taxable in the US and not the UK.

Thank you.