Good find. So just Germany, Italy, Spain and Ireland, not in Switzerland, not in France or Benelux or Scandinavia.

Well if anyone tries it, let us know what the speeds were like, whether 4G or 5G. Going to depend on which carriers it uses in those countries without a Vodafone subsidiary.

For instance, do they use either Swisscom or Sunrise or use some smaller operator in Switzerland? Same for other countries.

Because £27 for 30 days of unlimited, with 25 GB limit in EU, is very competitive price. The most competitive eSIM I've seen mentioned in this thread and elsewhere. That's better than local SIMs from the likes of Vodafone Espana and TIM or Vodafone Italia.