Last night I was privileged to watch an astounding piece of theatre. ‘Moon on a Rainbow Shawl’, a 1957 play by Errol John is currently having a revival, touring nationwide in a production by the Talawa Theatre. I caught the opening night at Birmingham Repertory theatre and was thoroughly enthralled by what was an epic production. The play is set in the mid 1950s in Port of Spain, Trinidad, and all the action is confined to a yard containing poor tenement housing. We meet a host of characters, the downtrodden Mrs Adams, who works day and night, married to Charlie, a man who was once an inspirational sporting hero, but…