This is an American group but I thought it could be useful for mothers with UK university children too. It may help to see and hear what they are doing to combat the antisemitism on campuses in America.
I have a child starting University next year. So this is definitely something I am thinking about a lot more now
https://www.timesofisrael.com/new-facebook-group-mothers-against-college-antisemitism-has-43k-members-and-counting/