The easiest question to answer.
"Why are British in Ireland"

so far, all answers have managed to NOT answer the basic question.

"Operation banner" was when the British sent British soldiers to "make peace " between British subjects of a "catholic tint" and British subjects of a "protestant tint".
The "Banner county is Clare"..

There were no catholic or protestant fights.. There never were... it was english propaganda... us and them. So, question remains.
"why are the British in Ireland "