From what I hear, they are doing restrictions, but they are light compared with other countries.
The school holidays start around 10 June in Sweden and go on for 10 weeks, meaning that they only have a couple of months or so before schools are closed anyway. Add in the fact that they are starting their trajectory later than most countries, and it may well be the case that they are choosing to deliberately keep restrictions light right now, in order to "get some of the infections out of the way during the warmer months when demand on healthcare services is low."
Because if they have had few infections so far and are only a couple of months away from a long school break, that could mean that if they were to push for really hard restrictions now, they could wind up with a population that still has very low levels of towards the end of this year as flu season beckons, resulting in a serious winter crisis, and it would be difficult to carry out a lockdown again in the winter if the population had already spent spring in lockdown--there would be no money or goodwill left.
Sweden is a very very digitized society--cash is barely used and everything is automated and computerized. I suspect the elderly are a lot more comfortable with technology in most countries, making it easier to cocoon them.
In short, Sweden's light restrictions may be OK for Sweden at this point, which is not necessarily to say that it would work for the UK right now.