With the help of government-issued pamphlets, an elderly British couple build a shelter and prepare for an impending nuclear attack, unaware that times and the nature of war have changed from their romantic memories of World War II.
This movie contains 14 potentially triggering events.
A dog is seen in a flashback so he will have been long gone by the time of the explosion.
There's also some kind of animal corpse during the part where Hilda reckons she can smell "roast beef" which might be a dog or a cat.
There wasn't a section for this but there's a part where the wife finds a rat in the toilet (shown explicitly) and this can be triggering for some people the same way spiders and snakes are. The scene is a bit distressing anyway because it starts with her screaming
The main couple gets into potato bags before dying and that was considered as protocol for keeping bodies after a nuclear attack, but they don't know, and die shortly after getting in.
The movie shows the main characters slowly dying of radiation poisoning. A generally ill appearance and blue spots is as bad as the graphic depiction gets, and the characters, while suffering, still naively think they'll be okay, so all the symptoms are downplayed
[SPOILER] though it does not happen on screen, it is heavily implied that both main characters are inevitability going to succumb to radiation sickness when they crawl into potato sacks
[SPOILER] Jim and Hilda discuss their son at multiple points in the film, thusly their deaths at the end constitute parental death, even though you do not see the son’s reaction (as it is implied he died in the nuclear blast)
I don't know if you can consider it PTSD but one character who lived through the blitz in ww2 gets unusually verbally violent when hearing the siren of a nuclear attack. He's really sweet during all the movie but gets completely out of character and agressive out of wanting to protect his wife. He then comes back to normal
There's also some kind of animal corpse during the part where Hilda reckons she can smell "roast beef" which might be a dog or a cat.