Our watch could change the story if it has some kind of magical or supernatural power. Maybe it can stop time, allowing the characters to do things that they wouldn't be able to do in normal time flow. Or it could be a watch that connects different dimensions, and when activated, it brings in elements from other worlds or times, completely rewriting the story as we know it.
It's likely about the Manchester bomb incident from the perspective of those directly affected. It could be survivors, families of victims, or first responders sharing their experiences, emotions, and how they coped with the aftermath of this tragic event.
Another possibility is that it was shared privately among a group. Check with the people who were involved in the wedding, like the best man, maid of honor, or close family members. They might have a copy or know where to find 'our wedding story' for you to watch.
You might find 'Our Dating Story' on Amazon Prime Video or maybe even on the official website of the show if they have a streaming option. Also, some regional streaming platforms could have it too.