I'm going to use the word 'hearsay' a lot in case we are barking up a very mistaken tree, Yew or otherwise.
I know you're playing it safe, but I think unless you have personal contact, or have documents pertaining to the person and/or case discussed, 'hearsay', like 'alleged', is redundant - you don't 'protect' yourself the more you say it.

It's like me declaring that King Charles eats live otters for every breakfast. Since there's no way I could know this assertion as a fact, then it is in the 'rumour' category and, as such, is hard to prosecute. I might believe it as true, but I can't prove it.*
Were I a member of the royal kitchen or serving staff, my assertion (correct or not) can give others
the impression that I speak with some authority. It is this that makes it actionable.
If you say something that is a rumour, that you cannot give a direct source - as opposed to 'I read it in such-and-such magazine' - then it's incredibly hard to be sued. You may be repeating a rumour, but this isn't actually illegal. Creating that rumour might be. And speculating the substance of a tale isn't actionable either, unless you categorically state it as fact with your own 'inside knowledge'.
If I were a close friend of Brand, I'd not comment at all, either in denial or confirmation.
* This is why if someone is being sued for slander or defamation, the truth of the claim is no defence. The case is being brought not to prove the claim, but to prove the intent of those who made it.