We'd like to remove Workspaces that were set up by members of staff who have left the organisation

[Barbara Wait]

There are no admins who can do this. Can you please advise how we can do this?

[Sal]

Hi @Barbara Wait! If you're talking about a free Workspace, all members of the Workspace have admin permissions just like everyone else. As such, you or someone else (if a member of the Workspace) can delete the Workspace if needed. However, deleting a free Workspace won't delete the boards. Instead, they'll be closed, to be reopened by the board admin. 

If you're the admin of the boards in your Workspaces, you can close and delete the boards before deleting the Workspace itself if it's something you want to do. 

I hope this information helps!