Was it lockdown that did it? Forcing filmmakers to sit at home, contemplate their lives, and conclude that just as soon as the masks came off, it was time to shine a light on their youth? Since Covid struck, we’ve seen Kenneth Branagh’s growing-up-in-the-Troubles memoir Belfast, Richard Linklater’s nostalgic animation Apollo 10 1/2 : A Space Age Childhood, and The Souvenir Part II, in which Joanna Hogg mines her film student days yet again.