Mat Collishaw, a key figure in the yBa movement back in the 1980s -- his contribution to Damien Hirst’s "Freeze" exhibition in 1988 was Bullet Hole, a large-scale photograph taken from a pathology textbook of a gruesome ice-pick wound in the back of a man’s head -- (b. 1966) is the perfect choice to inaugurate the new Blain/Southern Gallery in London.