It's valilum, and its unsafe not to come off when your body isn't ready for cuts, it injures the GABA system.
I'd never call it "maintenance" that would imply you're going to get a continuation of the service/medication. From me, you'd get a reduction (within guidelines/trust/circumstances) and if you weren't happy with that. I'd refer you to the drug and alcohol team/DTP, who will reduce you regardless. I will always call it management. You MANAGE the reduction, you don't MAINTAIN it. Don't like it, have a circle jerk, get reduced anyway.
It's win/win either way for the NHS/DTP's on the whole. Those that want to get clean, will stick at it, those that don't / "can't", get kicked off, back to using illicitly.
Certain ways around it of course, especially if you can pay for treatment privately. But then I'd hazard a guess that most people seeking methadone "management", can't afford to be treated privately.
The patient has to be in control of their own taper, not some doctor who isn't inside the patient's body.
Reducing too quick is asking for a failed taper, relapse, or worse, turning to some other drug, like alcohol, as I wouldn't have a clue where to get safe valium wihtout a script, as online illicit suppliers could be putting any old poison into their pills, so drug services are not getting people clean, they are even potentially creating a revolving door service, rush someone off valium = failed taper = relapse/drug/alcohol misuse = return to drug services, costing them more money, where's the sense in that?
I'm not saying drug services are bad for heroin or alcohol addicts, they can substitute these drugs and detox them, but for benzos, its a whole different ballgame.