Spirometry
Floatingfeather,
Thanks for that. It looks like I may ok then: in my chidlhood I did suffer from asthma (2 ventolin inhalers a day!) but fortunately I grew out of it and fortunately haven't had them prescribed to me for over 10 year now. I was also lucky in that when I did have it I didn't have any attacks.
I will certainly do what others have suggested about going to the gym/going swimming regularly to prepare for it though as this can only (hopefully!) have a positive effect.
Thanks again for your reply, all the best.
A.