Weavand is right when he says that there are different % CDT figures with DVLA.
The official stance is that for HRO, 3% or above is a fail
2.3-2.9% is refer for further information
Under that is OK.
(Incidentally, when research assessments are being carried out on alcohol dependent people who claim be abstaining, they use the cut off point at 1.6% to indicate that they are back on the waggon to some extent.)
BUT of late they have changed the goalposts . For HRO they generally do write to your GP regardless of your CDT result.
If there is any history of alcohol misuse on your files, they want to see abstinence for 6 months if it is called misuse, or 12 months abstinence if it is called dependence or you have been in detox.
Then they want to see test results for LFT at regular intervals through your GP, and then DVLA get you to have a
CDT test where they look for the result to be..... well I have seen it described as a maximum of 1%, or under 1% - which is why I tend to say 0/9%. Above that, or in Weavands case, an admission of drinking alcohol, means that you fail.