http://www.barbicanartsgrouptrust.co.uk/
I know this guy a bit, not well. The paintings look like he has observed real people, fat hanging over trousers, the shape of an opening in a woman's shirt etc.
They are most successful when the observation is amusing or the painting of line and colour hums, rather than ho hums. Compare to Alex Katz which have wider expanses of beauty but can be formulaic. The backgrounds are boring in Williams. A small show which will give some pleasure.