@MarshmallowManiac - Thanks for the offer, but I do have some spare ones currently, left over from the time I could still get them easily, and they will prescribe me more if I really need some, I'm sure. The one annual one is just their default now.
@Bercows - That makes sense, I suppose. My asthma is very unstable this year, despite a couple of adjustments to my preventer, a couple or courses of oral steroids, and I use salmeterol (long acting reliever) twice a day as a matter of course. I use a spacer and clean stuff regularly. The issue with the one Ventolin a year is mostly that when the asthma is bad, I could easily get through those 200 puffs in a week or two, just doing what I've been instructed to (ten puffs at a time to try to avoid needing a nebuliser trip), and because things can get bad, I'd ideally like to have one reliever by my bed, another in my handbag, at least.