RSU selling stocks vested across different countries

Hi, I moved from Poland to the UK about a year ago and have stock that vested in both countries. I’m looking to sell my shares and was wonderingwhat should I do in selling stocks vested across different countries. Any advice on how to approach this would be greatly appreciated! Thanks in advance!

Hi ,
 

If selling when you are in the UK, any gain will be reported here  . Thank you .