Pressure test came out at 0.9g, we subsequently discovered that the larder which is structurally part of the house but is actually outside the insulated envelope was not sealed off from the rest of the house, so it should be better than that but the architect doubts it'll get down to 0.6, he was happy with anything below 1.0. He's been building green buildings for a long time http://jonbroome.co.uk/