Class 1 medical examination exams in CAA at Gatwick in UK contains class 1 and class 2 exams so if you fail class examination due to requiremental contraindications AME can consider giving class 2.
In other words, in UK if you are doing initial Class 1 medical examination exam you are doing both class 1 and class 2 at the same time.
Is that clear for you?
I wish, it helps,
wite_k