You should be able to set up a government gateway account with a non UK biometric passport, see thread below for screenshots. It is very quick and you will then be able to see your NI contributions and UK pension forecast.
https://www.askaboutmoney.com/threa...r-online-system-difficult-to-navigate.230660/
https://www.askaboutmoney.com/threa...r-online-system-difficult-to-navigate.230660/