Dunno 'bout Pilot Class 1, or even if there is a difference between it and ATCO Class 1, but 'Salbutamol' (incl. brands like 'Ventolin'), were okay for ATCO Class 1. So too inhaled steriods, e.g. 'Becotide'.
What was a 'no-no' were steriods taken orally, i.e. in tablet or capsule form.
My experience was that so long as your condition was not debilitating and you did not have to use a 'reliever' several times a day just to live a 'normal' life, you were OK.