Mike Bartlett’s modest drama Artefacts, in town as part of the Brits Off Broadway festival, peers into the abyss of post-war Iraq society through the eyes of the aptly named Kelly, an indifferent English teenager played with nervy brio by Lizzy Watts. Kelly’s ordinary life with her single mom (Karen Ascoe) is upended by the sudden appearance of the father she never knew, an erudite Iraqi named Ibrahim (Peter Polycarpou) who runs the National......