Existing Dropbox account was under a work email; shifted this across to personal email (needed to secure content immediately), with a view of opening a second account under the work email at a later date.
Am now at that later date, but Dropbox will not allow a new account using my name and work email, and defaults back to the existing personal account.
It shouldn't be that hard to have two accounts under the one name, if using two different emails as login.