Hi @jonathanbuckland ,
Thanks for posting on this community.
I’d advise to have a look at this article: https://help.brevo.com/hc/en-us/articles/360001005510-Data-storage-location
Also, I can add that Brevo is certified ISO27001, and that the servers of our hosting providers (GCP and OVH) are all located in the European Union (Belgium and France).