The direct question was, did Muslim troops serving under British colours ever fight other Muslims? The answer is yes- and it's worth pointing out that they fought against religiously-motivated Muslim opponents in various parts of the world with no problems.
You seem to condemn Muslims for refusing to integrate into British society (which is fair enough, by the way), but when one does and suceeds, you then treat him with suspicion. You want to see Muslim protests against Iran? I think putting yourself in a position where you're liable to be ordering missile strikes on them is something of a protest...
The man should be an inspiration for British Muslims and an example of what can be achieved with talent, perseverance and acceptance of British norms without losing one's identity.