Muslim & non-Muslim marrying

Assalamu alaikum,

I'm new to this forum and wanted to seek some advice on a situation that's currently developing with someone quite close to me.

The lady in question is a Muslim and is planning to have a registry marriage under British Law to a non-Muslim man. They have no foreseeable plans for Nikah and to be quite honest, the guy isn't showing any interest in learning about Islam or becoming Muslim.

Myself and my partner both disagree with it but my partner says it's only a valid marriage if it was done by Nikah, meaning the girl wouldn't actually be marrying a non-Muslim because it would only be a civil registry marriage by British law.

The girl isn't a UK citizen and is also afraid of being alone or being sent back to her home country when her student visa expires. So she is thinking to marry him through British law and if he doesn't convert to Islam after 2 years she will leave him. She wouldn't be consummating the marriage though without Nikah.

Please give any opinions and advice.

Thank you

Assalamalecum Allah in Quran forbids us marrying non muslims until they become muslim for both man and woman in ch 2 v 221 of Quran, so yes the girl above is doing wrong.