[something765478]

> he was sent to the Slough House due to a mistake someone else made.

No, he was sent to Slough house over his reaction to that mistake. He disobeyed orders, caused panic at an airport, and assaulted a civilian. Now, that would have been fine if he was trying to save lives, but the whole thing was just a training exercise! He deliberately put people in danger just to massage his own ego; he absolutely deserved to be "exiled".