Just a quick update, had today off work so took all the matrix and radiator hoses off and flushed it all through so it was running clear water, took out the water pump to check, it was ok but it was the one with the plastic impeller so whilst it was out i got a new metal impeller one and fitted it, refilled system with antifreeze/ water and ran car for 20 mins with the cap off and guess what HEAT lovely Heat!!!! I would just like to thank everyone for their great help, could not have done it without you.