Just spotted on the portal whats new page - the original API is being sunset on 20th June along with the original dashboard. Anyone using the old API will need to port to the new one @hoggy I think you are in this camp.
From whats new "Speaking of the old portal - for those still using our legacy APIs, the old portal will be fully taken down on the 20th June, meaning that they will no longer be accessible. After this date, the existing GivEnergy app will no longer work, meaning that users who haven't downloaded the new version yet (which we're still working on!) will not be able to access their data or control their system."

