The new reg's basically preclude any sort of drinking of alcohol whilst undertaking the privilages of your licence, as an engineer, atco or pilot.
There is an alcohol limt, but I can't recall what it is, and it's so low it's not worth your while to risk it.
Additionally, the Plod no longer have to have "reasonable grounds" to enter your home/place of work to breathalise you, mere suspision or an anonymous report is sufficiant, and they can force entry if required.
The exact wording is contained within the Bill, a copy of which was given to me by my employer.
Given the amount of alcohol participation which I have seen in over 25 years in the industry, I find the new reg's not so much worrying, as common sense, and not before time either.