As far as I am aware defamation is falsely ruining ones reputation by claiming.false accusations. Everything that has been said can be traced back to Lloyd himself. There's nothing anyone has said that can be proven to be untrue.
Besides, if Lloyd does happen to go down the path of hiring a lawyer in the UK I'm sure a class action lawsuit can be arranged as a counter to his pathetic attempt.
--Edit---
Something else that has just popped into my mind. Wouldn't legal proceedings expose everything he's been up to. Like what he does with his Patrion donations and things like this. Would he want that type of exposure for the whole (exJW) world to see?