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Letters should always have a reference, because that’s what DVLA use to tell us when they’ve sent a letter. If a letter has a reference of `None` then DVLA say they’ve sent a letter with a reference of `'None'`. This means we can never reconcile the letter, which means it stays in `created`, which means it never gets billed. We don’t think this has affected any real letters yet, just ones that we’ve sent as tests.