One of the key points to take from the madness of Mayweather-McGregor is this: maybe the word ‘circus’ should not have such negative connotations when it comes to unnarmed combat.

It is 19 months now since Conor McGregor last fought in Dublin, and it is an evening worth revisiting as he returns to the Octagon tonight as the headline act in the UFC’s latest Fight Night at the O2.