Lordy, you lot can't half talk. I'm afraid I've only skim read as time is getting on and I really need my bed.
Keir, no use asking me about vegetarianism and colds as a) I'm not a veggie, and b) I have a better excuse for getting respiratory illnesses - double pneumonia, pleurisy, pneumothorax and two collapsed lungs requiring a lengthy spell in hospital and an emergency phone call to my parents 200 miles away to tell them to get there quick just in case I kicked the bucket in the next few hours. That was nearly 10 years ago, but I still have scarred lung tissue and a slightly weakened immune system.
On behalf of Jools and I, I must protest at the age generalisation. I am 31, and I believe Jools is younger still. I'm 5 foot 6, 53.5kg (which is too heavy for me cos I have little muscle mass and a tiny head), I overpronate and heel strike badly and have slightly reduced lung capacity (see above!)