Hi there.
Tough to say. It’s hard to know the effect of on/off periods for different people, and how it accumulates/dissipates accordingly.
All I can say is that from my experience when I was ‘winging it’ (i.e. using Medichecks to check what I could get away with, or - more accurately - when I still hadn’t realised I had a problem, and was still in denial) it tops out at >3.0%, and absolute baseline for me is about 0.8%.
During heavy drinking days I’d only lose 0.05-0.1% percent per day sober I reckon, but it racks up fast when you’re not. Especially with consecutive days’ drinking. This meaning it would take 3-6 weeks’ sobriety to dry out completely. And about 2-4 weeks not to raise any red flags (1.6 or above - if you’re above this I doubt you’ll get your license back TBH). I think 1.1-1.6 is amber for us HROs.
Where in those date ranges it could be is anyone’s guess except for your blood’s.
But the average of 1.6 is based on average UK population intake. Which is about 21 units.
So if 21 units spaced out however equates to a constant CDT 1.6, it depends how many you reckon you are over that, and then subtract 4-8 (for abstinent 8 days) from that.
Personally I think you’ve left it a little late to be too confident. But you aren’t a heavy drinker by the sounds of it, and if you recover pretty well and are in good health you’ll probably find you’ll be OK.
But it all depends on your honesty and relationship with alcohol. You can’t really cheat this test, and believe me many have tried and failed. Waaaaaay better just to quit, be honest and not worry, than play these games for a habit that’s caused so much woe already.
Good luck.