British national, lives in EU, applying for finance for 2022/23

You'd be best talking to UKCISA on their student advice line.
They'll be able to explain how the rules work for fee status and student support for his individual case (and the specific rules he would fall under should you need to appeal an assessment)

Hello
Can UK nationals still get finance using the right to roam principle?My son UK born, lived in Spain most of his life now would like to study in UK.
Thank you