How did the Bradford City stadium fire change football?

It was supposed to be a day of celebration but turned into one of absolute horror.

40 years ago this week, a fire tore through Bradford City's stadium on the final day of the season, killing 56 fans.

What caused it and how did it change football forever?

ITV Calendar Sports Correspondent Chris Dawkes tells Lucy Watson what you need to know.

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Watch Never Forget: The Bradford City Stadium Fire here: https://www.itv.com/watch/news/never-forget-episode-one-city/5wnq1w5