Update - put in new pulley bearing and new water pump. P gasket leaking, so got new gaskets and removed...I found housing cracked top and bottom. Crack towards pulley housing location and a big piece broken off at alternator bottom bolt hole. However I tried to braised repair with no luck so chem welded it. Just need to clean it up and re drill. I popped into my trusted supplier "RST landrover" and got a used water pump housing for £20. At least I found the problem.