If you do have a blood test now and you are showing abnormal blood markers then DVLA will not issue a licence, just to give you some idea (however we are all slightly different) I was drinking roughly 30 units of alcohol per week (this is what got me revoked) fosters lager, my liver function was raised to 170 and it took 3 months for my liver to return to normal with `complete abstination,leave it as long as you can because if DVLA get abnormal blood markers by medical evidence then your revocation `will be extended until you can supply 12 months of liver function test all showing normal, let me just point out it can only take 24hrs to raise your liver function......to answer your question tho wait 3 months if you can then have a blood test, if you are showing abnormal blood markers then there's a strong chance DVLA will put you in the depenedance bracket......