EXCLUSIVE: Here’s the first trailer for Edinburgh Film Festival-bound Brit comedy Old Boys, starring Black Mirror and The Imitation Game actor Alex Lawther. WestEnd Films handles world sales on the Film4- and BFI-backed movie from first timer Toby MacDonald. Also starring are Pauline Etienne (Eden), Denis Ménochet (Inglourious Basterds), Jonah Hauer-King (Howards End) and Joshua McGuire (About Time). In the school-set reworking of Cyrano de Bergerac, an awkward but…