Yes , Knox had what I heard were some pretty serious health issues a while back , but , I also heard he's doing fine , now , but has chosen not to tour with The Vibrators , anymore.
Also , he must be about 70 , by now. Touring must be a bitch. Some people can do it.
He still records with them , occasionally. But , you know , he was the whole personality of the group. The one time I saw the band , sans Knox (The word had'nt got out , yet , about his illness.), they soldiered on , they were trying , but , they needed a frontman , and if Knox was unavailable , they needed a ringer, in my opinion. Another Lead Singer /Guitarist might add a new dimension , but , it's like The Buzzcocks without Pete Shelley.
Knox is a super nice guy , too. Very funny and pleasant . Those are the ones you remember.