What would be the next inhaler up?

Hi all,

I have had asthma since a baby and was on Clenil Modulite 200mcg inhaler preventer for several years. After being diagnosed with Crohn's disease and prescribed immune suppressants I have found my asthma is more easily triggered and the flares are worse. Even brisk walking makes me feel wheezy.

I went back to see the asthma nurse and asked to be prescribed a new inhaler. I have been prescribed Fostair 100/6 mcg. This isn't helping.
What is the next stage up?

Thanks