Hi Guys.
Thanks Keith. I had replaced the radiator cap, but alas I did not check the pressure, I took the radiator guys word that it was OK for my Jeep.
I removed the head gasket, easiest job ever, I just lifted it off, I didn't need to prise it at all, there were a few tell tale signs where the water had seeped under it. This also matched the rust marks on the head. So as I suspect it may not have been leaking for long, I hope so. I removed the spark plugs and only number 4 spark plug looked like it had been in contact with water. The work continues.
Cheers
Tony