Well I had a look at the exhaust today and the manifold, the exhaust still looks solid and I checked all the joins and they look to be leak free. Damn it was cold
The Manifold however I found a loose bolt in the top row and missing 2 bolts in the lower row which annoyed me fortunately no snapped studs.
I had to fit a new bolt in the one which was loose, used my tap & die tool to clean and check the thread in the head, bolt tightened in spot on.
There were 2 lower bolts which i managed to put new bolts in as they were loose but I dont hold much hope for them at the moment as I had a garage do some work on the car a while back when they did the HG and I think they may have mucked the threads up good and proper.
Still moment of truth will be in the morning with a cold start.
My plans for the future are to totally remove the manifold and retap all the threads and fit a new set of bolts.