So I bought a new plastic flange and hose for the rear of the head. After parting with the cash at the stealers and removed flange and hose i inspected the flange but found no crack in it, but the O ring was shaged and it must have been failing. Feeding the new hose though the rubber boot is a real bitch,, but did it after a few goes. A bit of lube would have helped!!! After connecting it all back up,,, no leaks at all so thats good. I you buy a flange it comes with the O ring already fitted, this is fitted on the back of the head, you still need an O ring for the metal pipe that fits on the right side of the flange. (the 2 bolts on the metal pipe are quite short and you expect them to be longer so dont get carried away undoing them or you will drop one) Its a fidily job and helps if you have small hands like me,,but still got so cuts and scuffs.