Double degree in psychology and criminology?

Hello! I’m going to university next year and I’ve started to look around and I’m really interested on studying in the UK, I want to study a double degree in both psychology and criminology, and I’ve found some great options but I’ve noticed that it usually only last 3 years?? Which is weird since it would take me 6 years here in Sweden (and I’ve check Spain as well as an option and it has also a 6 years duration) so I was wondering if in case I choose UK to go to university, would be the degree worth the same as one studied in Sweden or Spain? Or the value is different? I’m really confused, I really don’t want to choose the wrong option and end up with a incomplete certificate.

I assume you mean a Joint degree, as in the UK this is fairly standard fare and not the same as a double degree. It does not mean you are doing 2 degrees but simply a bit of both and your degree qualification will be complete at the 3 years time and you will come up with something like BSc Psychology and Criminology, not a separate degree in each. Not a clue about abroad ref 6 year degrees in both, sounds like a waste of 3 years but maybe i am missing a key benefit.
Greg

Does UK have actual double degrees where you finish having both in a complete matter? If so what’s it called Thanks for your answer either way!