Said since he is 37 years old now, he can't handle being away from his wife, his two sons (1 and 3), for so long. He is done 'drumming' altogether, so apparently it isnt a problem within Paradise Lost. They cancelled their South American tour in order to get a replacement.
I really liked their last two albums. If they're still going to tour, which I assume they are, I would like to see them.