Directors put the footy on the big screen at work so we could watch a big match a couple years ago. You were meant to make up your hours of course. We do that anyhow.... which is why I'm doing my expenses on a Sunday night. But then I can take an hour in the morning to go to solicitors. Swings and roundabouts, as long as they are declared.
Internet is a giant bear trap if you employer doesn't like something though. I look to see how its going in Gaza occasionally and I also fly racing drones, so look for stuff about that as well. The combined algorithm might be a red flag. Best to stay off the work machine - and don't use the same browser at home as they use at work
Our politicians like to use Whatsapp and Messenger to communicate state secrets as well as text you'd never say in public. It's a field day for the press