Hancock & Joan (2008)

In the mid-1960s, Joan, not long married to comic actor John Le Mesurier, meets and is mutually attracted to comedian Tony Hancock, married to the long-suffering Freddie. Hancock's most successful period is in the past and he has become depressive and alcoholic, recently emerging from a stay in a rehab centre. Joan tells him that if he can remain sober for a year she will leave John for him. Hancock goes to Australia to film a comedy series there but it does not work out and he commits suicide. Joan stays with John until his death in the 1980s.