A quick update.
Spent a few hours on Saturday having a look at the car.
Took the plugs out and visually inspected the combustion chambers using a bore scope and there were no signs of coolant seepage in the chambers, checked the spark plugs to see of there was anything evident on these but they were fine, ran a compression test and this was fine, never had a chance to do a leak down test as I couldn't find the adapter I needed to change the air line connector to the fitment I needed (typical) - another one on order so I guess we will see when that arrives.
I decided to do another coolant sniff test... ran the car up to operating temps and did the test again to my amazement this time it passed...
http://www.youtube.com/watch?v=5U8wR7DwraU
Cant really understand this, to make sure the fluid was working (and to make sure there were no blockages in the tube) I went around the back of the car and popped the end into the exhaust and the fluid went yellow so its working the way it should.
I retested the car 5 times that day and they all came back negative so happy days!
I am going to revert the cooling system back to how the stock system worked to see how that goes.