The graphic would seem to indicate that the UK and Portugal observe a time zone of Coordinated Universal Time (UTC±0). This is nonsense, of course; UTC is not a time zone. I believe the UK observes GMT (UTC±0) and Portugal uses Western European Time (UTC±0). It's also worth looking up the story of why Coordinated Universal Time is abbreviated UTC and not CUT, if you haven't heard it. Time zones are great.
> I believe the UK observes GMT (UTC±0) That's correct, with BST in the Summer. It can get confusing when working with people from different countries who aren't aware of BST and who schedule meetings explicitly in GMT, thinking that it automatically includes daylight saving.
It's PDT in summer.