I know it's been a little cooler this week but when I've started my car first thing in the morning I'm getting quite alot of white smoke from the exhaust. Recently the engine has been misfiring at first but a couple of blips on the accelerator normally sorts it out. However, this week it's taken around 30 secs of blipping before it settles down. When I started it yesterday evening it misfired at first but just as it started running normally a cloud of white smoke billowed out. This didn't last long but it made me think that coolant might be leaking into one of the cylinders when the engine cools down. I removed the spark plugs this morning and when I looked into cylinder no. 4 I could see a reflection of the sky. I'm assuming this was coolant sitting on top of the piston. I tested the compression with the engine cold, as I think that's when I have an issue and it runs fine when hot, and got 220, 200, 220 and 218 psi respectively from cylinders 4 to 1. I was expecting number 4 to be really low. This is what the spark plugs look like with no. 4 being on the left. There's no oil in the coolant expansion tank and no emulsified oil under the oil filler cap. Am I being paranoid, do I have HGF or could something else be causing the white smoke? All suggestions gratefully received! Thanks, Chris