USA RSU's tax credit relief via HMRC self assessment

Has anyone ever declared their RSU income in their tax return, with the exact same scenerio as " https://community.hmrc.gov.uk/customerforums/sa/d00aeab4-1374-ed11-97b0-00155d9c7b1d

And actually received some tax credits back?

Most of us have the NIC, company NIC and tax paid via automatic selling at vest, this is the first I have reas of adding it to the SA and some form of credit being possible

Does any one know of the conditions that this could apply?