Well, after Monday's truly hideous run after the excesses of the weekend, this felt much better.
Legs felt good after about 5 minutes and none of Monday's breathing issues reared their head.
My main problem still is that the night before I'm due to do an early morning run, I am completely and utterly besieged by gremlins through the night. I'm constantly waking up worrying about the run which makes for a rubbish night's sleep. Does this happen to anyone else?