Thanks so much for taking the time to reply with all your useful adfice. I got up wheezing this morning, it's very foggy outside, so I can add that to my list of triggers! It's only been a few days, but the inhalers are already making a dramatic difference.
Hope you all have a good day, I plan to stay in and potter all day, it's one of those rare weekends with nothing planned - I shall make the best of it.