Love is blind, but David, head over heels, thinks that love is a colour. He has even tried to paint it. He knows that his Natasha's smile is blue. David and Natasha are both black, but they are different kinds of black. His family comes from Nigeria, hers from Jamaica. "White is a collective," says David, "and so are the Asians. It's only us who are divided."
The divisions run deep. David's elder sister, the mouthy Kemi, warns that David will be disowned if he continues his relationship with Natasha, whom she calls "a piece of crap" even though she has never met her.
Natasha's father, Malcolm, warns his daughter away from David, and even implicates him in the slave trade: "Because of your actions we can never be liberated."
Will this latter day London Romeo and Juliet defy their families, or are the cultural and family ties that bind more powerful than love?
Written by Femi Oguns, who also plays David, this is a real sit-up-and-take-notice debut from a new young black writer of talent who tackles an explosive subject with honesty and verve.
Yes, there are things wrong with the play: the ending topples into melodrama, for instance.
But it is entertaining stuff that negotiates a path between the thought-provoking and the riotously comic, particularly in the character of Kemi, and her henpecked fiance.
It is all helped immensely by Raz Shaw's confident and delicate in-the-round production, which adds patterns and coherence to the proceedings played out against Hannah Clark's graffiti-dominated design.
· Until August 2. Box office: 020-7503 1645