Well, it was a lovely afternoon, would have been rude not to go flying, wouldn't it?

Pleased to say I've just had 4 x 12 minute flights (pretty much empties the tank) and not a hiccup or cough from the engine throughout (and it was only 3degC ambient). It seems leaning the regulator slightly has done the trick - I didn't change any settings from where I finished up yesterday.

Thanks again for the help.