Most people who I asked said it was more than likely either a cracked block or Head or dodgy h/gasket and that the only way to tell was to strip it down again 
So I rang Luke up to see if he had any suggestions and he asked if we'd re torqued the ARB head studs down, we hadn't done this as the instructions from ARP state you do not need to, but Luke was adamant they should be,,,,, well guess what when we re-torqued them we found one was loose 
so a massive thank you to Luke for his wealth of knowledge of all things mr2 as if it wasn't for his suggestion I'm sure we'd have needless taken the engine out by now ](./images/smilies/eusa_wall.gif "Brick wall"){kind=small}
So Luke we thank you 