I usually just don’t drink at all if I am driving, has literally been about 3 times I’ve ever had one(only) before driving, pints are like bikes in terms of N+1 so best not to start if you intend to drive!
Also having worked in insurance some companies specify they wont pay out if you are under the influence of alcohol, as opposed to be convicted of drink driving etc, so even if you blow under the limit by admitting you had a drink before driving they will try and get out of paying…