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Sorry for the late reply, was cooking up some chicken nuggets (so posh eh).
We think he has colitis, he's due at the vets tonight. He isn't the one who bit me but I have spent time sat in the kennel with the pooch that attacked me and I've managed to get a collar on him (without force) and a harness and take him for a walk. He even let me pick him up. I did go in with chain mail gloves on but then decided that 1. I can't work with them on and 2. He is going to think I'm scared of him which I was a little but we managed it :) I've got a video of me walking him and I can probably upload a still of me holding him.