If I remember correctly, the plan is that UK TV channels cancel all entertainment programs for the next ten days, so I look forward to more people going outside for the end of summer.
Even so, it's a different era now. When Diana died, the TV and radio were certainly very different for a good week thereafter. Nowadays, even if most TV and radio changes its schedule, there's Netflix, YouTube, Disney+, BBC iPlayer, 'catch up' services and all the rest, so you could very easily not be exposed to the national mood in the same way.