Maybe I'll have to put it all back together tonight and pray it's not hg failure that's blown it all out of the rad, shouldn't be (touch wood) as boost increase was only 0.3 bar, and was running sweet, I had been loosing a little coolant so maybe it was the smallest of holes that let go on Tuesday night, new rad turn up today so will fit on dinner then bleed tonight.
Is the one being broken the white one at martins ?