Hi Pugzy,
thanks for the reply - and I dont think you are being rude. As I said earlier, I am genuinely interested in the question and not trying to wind anyone up.
We all agree that with the wind from the left in the NH, the low pressure area is in front of us (whichever law you use!) and the high must be behind.
The reason I am suggesting that the OAT could be increasing is as follows. We are at FL180 so we are banging along with 1013 in the kolemans window of the altimeter. If heading from a high pressure towards a low, and not correcting the altimeter setting to local QNH, then the altimeter is lying to us and the nearer we get to the low the more it is lying, ie we are actually getting progresively lower in the athmosphere => decending and if decending the OAT is increasing!!