Antisemitic and Racist classmate

Hi, first up this is in England.

I'm looking for info on whether I can record a conversation with a classmate. I want to do this because they are very antisemitic and racist but teachers can't do anything except talk to him if there's no proof and I'm honestly fed up with it. It used to be a bad joke every now and then but now it's everyday. In the FAQs it is said that I can record a conversation but can't share it so I'm really asking if I would be allowed to share it for safeguarding reasons. Sorry for the likely unnecessary question but I feel that I need confirmation on this. I will of course ask my school about this as well.

If anyone has alternative suggestions please share them.

Sorry again and any help is appreciated.