Interesting comments. Actually, I'm surprised (or maybe not) that Finland was the favourite. Apart from the cha, cha, cha - which was catchy but annoyingly so - it was awful. Singing and visually.
Sweden's entry I thought was very good and actually better than Euphoria. Staging cool (I think each country bring their own sets?), but was distracted by those nails so I think that put people off, because if you listen to it without visuals, it's catchy (and a top streaming track even before the competition).
Don't forget, Loreen/Sweden did come in 2nd in the public vote, it's not like she didn't get any of the people's votes! Sweden are prolific music producers so a lot of the tunes you hear from the big US/UK stars are written/produced by Swedes so maybe there is a familiarity that means the Swedes generally do quite well in these competitions.
Johnny Logan won twice so she's not the first, and there have been several other times a winner has entered a second time, though not necessarily winning on return.
I actually quite like the UK tune but performance a bit meh. UK will never do that well in tele voting because Brits generally are not into the Eurovision like some of the other countries, so their expats (compared with the Nordics expats) will never be the most prolific voters! And Brexit and Boris hasn't helped with the UK image abroad...