Alfisti, from what I've read on here, it would be difficult to gain an initial Class 1 with established Ischaemic Heart Disease.
Having said that, it sounds like the diagnosis hasn't been established. It's very rare (but not impossible) in a 30 year old, and irregularities in an ecg is an unreliable marker.
The treadmill test, and those tests mentioned on here, are pretty reliable at excluding IHD.