H alf Man , writer and actor Richard Gadd’s eagerly-anticipated follow-up to the hugely successful Baby Reindeer , begins with a joyous scene. A glorious wedding party is in full flow with revellers dancing merrily in the sunlight. In typical Gadd fashion, however, it doesn’t take long for a more brutal reality to kick in. He plays the hench and brooding Ruben, who viewers meet stripped to the waist and looking like he’s about to step into the UFC Octagon. Opposite him is Niall (Jamie Bell), the kilted groom clearly wishing he was anywhere but in a dimly lit barn with a man whose heavily strapped hands suggest he didn’t come to propose a toast to the happy couple. “You don’t have to speak,” Ruben tells him.…