Civil Service referencesWatch
they aren't allowed to give you bad reference. Civil Service is slow with checks, email them to chase up.
So they could say about any warnings, getting sacked, any other disciplinary action, that you were late often etc etc etc. As long as it's true. And stuff like that they usually have the evidence to prove it.
But they can't say stuff that's subjective. So if they thought you were lazy, but don't have anything to back it up, and that's just their opinion, they wouldn't put it on the reference.