It's remarkably insightful. It was made in 2018, looking at the possibility of a future pandemic. They developed an app which 10's of thousands of people downloaded and it enabled them to model very accurately how people move and interact on a national scale, and also how infected people might infect others. It's not specific to COVID-19 - which did not exist at the time obviously - but modelled other potential new "flu-like" viruses which might one day come from the far east.
The section from 57' 30" shows how the infections would spread across the UK, following an initial 1st case in (randomly chosen) Hazlemere. It showed 42m people being infected within the 1st 4 months. And 800,000 people dead.
And here's the scary thing - if that is not scary enough. They modelled an R0 (transmission rate) of 1.8. This is lower than COVID-19, which is somewhere between 2 and 3. And they modelled a death rate of 2%. Again, lower than what we have seen with COVID-19 so far. So it could be even worse than this, UNLESS drastic counter-measures are taken right now.