Eventually managed to get my LH exhaust manifold fixed after the flange cracked off on the Watagans trip last month and no one willing to try re-welding it. It turned out to be a one off special with the flange at an odd angle so no chance of a replacement but a foundry in Sydney I dealt with for 25 years or so were able to braze it back together. Back on now and working fine but not sure what will happen if it gets really hot!
Ian W.