Operation is back to normal. The queues were backing up due to a problem with a single customer. We're working with them to resolve the issue but in the meantime have cleared their requests from the queue to stop it affecting others. Apologies for the inconvenience this may have caused and thank you for your patience whilst we investigated.
Posted 22 days ago. Jul 26, 2019 - 14:42 BST
The issue has been identified and a fix is being implemented.