Withholding tax between UK Company and EU resident

Hello, It is withholding tax rules apply when UK limited company has agreement with Polish resident? Agreement is about creation of an mobile application with transfer of copyrights. Is there some relief from paying WHT? Thank you!

Hi Anna,
You will need to complete the following form which is in the link below and send to the address stated at the top of the form. 
Double Taxation Treaty Relief
Thank you.