Went yesterday for above tests.
40% reversability with ventolin
Fev1 in 2014 = 1.07, 2015 = 1.21, 2017 = 1.11 all a bit of a mystery to me
DLCO 2014 = 46%, 2015 = 51%, 1017 = 50% of predicted
Fit to fly showed a drop from 93% on room air to 71% on airline mix and back to 91% on airline plus supplemental o2 at 3LPM. I take this to mean that i need at least 3LPM when flying, see specialist again in August and will see what he has to say.