I was given a guarantee that v1 cloud would be supported for a decent amount of time - yet I am just today seeing a message in the UI saying that my "legacy" account will be frozen in July? Can someone please explain how this has happened so abruptly?

Hi there @Joshua Greenhalgh - that message pertains to self-serve Starter and Standard tier users. I just DMed you to verify that you are in that group. More information about freezing self-serve Prefect Cloud 1 accounts here.

Thanks for your help @Chris Reuter