The current law is arbitrary and capricious. It is impossible to know just by being there whether an area is 'designated' and one must accept the view of a police officer if questioned.
The sole determining factor in whether you must cease to consume alcohol, the alcohol is confiscated, or nothing happens at all is the whim of the police officer. This leads to sporadic enforcement and an arbitrary severity of requests, with some police forces automatically requiring alcohol to be confiscated and others not minding its consumption at all unless trouble occurs.
The Act also contains clauses which nullify bye-laws relating to consuming alcohol but the police seem unaware that these bye-laws no longer apply.
The police often tell people it is 'illegal' to consume alcohol in designated areas, whereas the Act clearly states it is only an offence to refuse to comply with their orders, which may never come.
In general, this is a flawed piece of legislation that is not well-understood by police or the public and which is abused by councils who feel that their entire territory should be covered.