It's impossible to have zero percent alcohol reading, as it would make life ridiculously complex. It's fine as it stands now, as if you're sensible you'll stick to the one shandy, and if you're a ***** you'll just drink 10 pints and not care.
The new fines seem like a fairly good idea, but only if the realistic versions are scaled up accordingly. No-one ever got £2500 for speeding, more like £600 if you were going over the ton, so would that now equate to a £2500 fine? Or will the mags wimp out for fear of overloading the system with appeals and leave it as it is now? I don't know.
If you don't want to pay the fine, then don't break the law. Obvious, I know. Patronising, I know. Still true, though.