Returned to sender   Sydney’s Belvoir Street Theatre is conveniently located between after-work drinks and a good night out. Tonight, eighty dollars buys eighty minutes of a new play, a program, and the company of an audience who resemble the congregation for the Sydney (Left) Writers’ Festival. Forget Me Not by Tom Holloway is a co-commission by two self-important theatre companies, Belvoir and the Liverpool Everyman and Playhouse in Britain. It deals with the familiar story of the UK child migrant scheme to Australia, as a man in his sixties recovers his past. So, within a neat suburban living room…