Also, I think that the Samaritans is pushing the wrong message about mental health. The ridiculous illusion that 'just talking to someone' is a positive step in every situation. This is a horribly pervasive narrative at the moment.
Sure, it is a good thing that the Samaritan's helpline are there for people who do need to talk to a stranger. But unsolicited well-intentioned chat is no more a solution for mental health problems than it is for backache or heart disease.
Any number of people in the situation that man appears to be in would simply feel harassed and stressed by the woman's approach. And even if they didn't, even if they welcomed it, where is is supposed to go from there? She isn't going to become his friend, and if she helps him to get attention from the authorities the very likely outcome is that he will get assessed, fobbed off, and put on a waiting list for an NHS response which, when it eventually happens, is soul-destroyingly, bureaucratic, fractured, discontinuous, etc.
Actually one thing that the ad is accidentally honest about is that when the woman approaches him, she is doing it to feel better about herself, to feel like the chilled wild-child version of herself, not the uptight frump. Not fair to use a distressed person in that way.