As one of the few dramas that takes place entirely outside, Arthur Miller’s All My Sons was theoretically an ideal choice for the repertoire of the Open Air ­Theatre in London’s Regent’s Park. And as the opening lines include “Gonna rain tonight”, Miller’s 1947 play further suits a venue that is as vulnerable to the weather as a cricket ground. And, when theatregoers are lucky to be spared rain, heat and hay fever can make the experience differently uncomfortable at a summer matinee, which was the slot in which I saw the Miller revival. So it’s a measure of what a fine play All My Sons is that it still worked in these circumstances.Miller’s major characters tend to be delusional and All My Sons features a dreamer in double denial. Kate K