Woody Allen goes London with this excellent (but just a thriller) thriller about tennis instructor Jonathan Rhys-Meyers who marries up (to Emily Mortimer) but starts cheating with his new brother-in-law’s girlfriend (Scarlett Johansson). Rhys-Meyers and Johansson are both excellent. Impeccably executed, with a great British supporting cast and healthy nods to the old Ealing comedies.…