Cape bees and asexual reproduction

Amazing piece of research reported here: https://phys.org/news/2020-05-gene-honey-bees-virgin-birth.html

The interesting/worrying section reads: "Every year in South Africa, 10,000 colonies of commercial beehives die because of the social parasite behaviour in Cape honey bees."  

What prevents Cape bees arriving in the UK?

Masses of parasitic eggs laid by parasites in a dying colony. Credit: Professor Benjamin Oldroyd/Univeristy of Sydney

More information: Current Biology (2020). DOI: 10.1016/j.cub.2020.04.033