Well a little update is in order here.
Last Thursday he went in to have the old pin removed and a new one put in, the vet rang me about four hours later to let me know he had failed getting the broken part of the screw out, he had dug in and gained hold of the tip of the screw, but had been unable to get it out. In the end after a lot of ringing specialists he had to stitch Louis back together and then order a special tool to drill around the screw and hollow the bone out to get it out, so he had to put him under again the next day!
This time he was successful and we now have a nice big screw set up in his leg, he had to put it in the wrong way round medially instead of lateral due to the damage caused getting the old screw out but it should be all fine!
The dog doesn't care at all, this evening we went in to get the soft plaster removed and all I could here in the back was the vet trying to keep him under from running around everywhere 
At the weekend I finished building up my new Chumba and he was resting in the back of my car, I slung my leg over the new bike and realised 100 yeards up the road I realised there was my dog limping along behind me!. He got told off severely, put back in the car and made to stay where he was!
Anyway here's the important bit, pictures
The new screw is twice the size of the old one and is actually used in horses!
