No, no one has said which type sadly. The vet he went to see on Friday was Ellie and exotics vet at Alfreton Park vets which is in the vet locater. Ellie said that she thinks he's emptying his bladder when it doesn't need emptying because he feels uncomfortable, hence giving him the metacam.
Like I said, he is no longer peeing blood, not squeaking like he did when he was peeing/pooing, but he is moaning a little bit, I am not sure if it's Big E bothering him, because someone times he'll tell Big's off or he'll just have a chunter to him, when we ;last check he had put weight back on, but his poo is small.
I'm going to ask my son to get them both out again later and put a towel/mattress protector on the floor to see how he is and check if he is indeed making the noise due to pain or if he was just chuntering to Big's, will also check his pee again and weigh him.