Thank you all for your comments.
Rangers - you are right, it is about lowering my expectations. There was a really helpful part of the course that talks about aiming to get it right 1/3 of the time; putting it right 1/3 of the time; and putting the other 1/3 down to experience. I know that in reality I'm really proud of myself as a parent and how much I get right, I'm just aware that me shouting at my son for 10 seconds is going to leave more of an impression than playing happily with him for half an hour so that's why it needs to change.
ikea - I'm not sure I could physically manage to change him like this at the moment - he can stand but when he's upset his knees turn to jelly so this could end up even messier!
MissB and ppeat- I have half a day a week when he goes to my parents so I usually spend time in the garden, which is bliss. I think I am stressed a lot of the time, I noticed the other day when in town that I was weaving in and out of people at full speed with the pram while everyone else was ambling along enjoying the weather and I wondered why everything I do seems to have this edge of panic and rushing to it.
I have always noticed that eating healthily has a significant effect on my mood, I following an anti-PMS diet a few years ago which was brilliant, but my diet at the moment isn't as good as it could be - why am I making sure he has blueberries and peaches on his breakfast when I'm pouring a tablespoon of sugar on mine? I'm going to dig out the PMS book as I know that will help level out my mood to some extent and I'll look at the wheat issue as well.
Bot - I'm sure that the stimulation will do us both good as well. He is always so excited to see different environments and people, and even spending a few hours away from him makes me appreciate him more, so hopefully this will also have a positive affect on my general mood.
I tried your version of nappy changing this morning - no crying, no wriggling, no scratching. Bloody hell, it was such a relief! Let's hope it wasn't just the novelty of it and it carries on!
Thank you again - I feel really determined to actually do something to become a more positive role model instead of just accepting that I have a temper therefore my son will have a temper.
x