You seem to be a little naive my friend.
Common characteristics of a police state, wide spread spying on citizens, warrantless arrest and detention, torture, rigged judicial system and trials, execution of citizens without due process, suppression of a free press, suppression of opposition parties, censorship, seizure of property, targeting of opposition groups and minorities, prevent freedom of movement.
You do realize the U.S. and U.K. have engaged in all of these. I can run through examples of each if that will help enlighten you. The U.S. and U.K are not particularly iron fist police states, they prefer more the velvet gloved fist. They aren't particularly wide spread or oppressive police states yet, just give them time and a few more excuses.
It is no secret the U.S. has tortured people on a wide scale and very recently. This precedent has been set and the people who did it got away with it. Obama has dialed it back some, preferring to let third parties do it so he can claim the U.S. isn't torturing but the U.S. is still actively participating in and bankrolling it.
Obama has executed at least three American's by drone, which is the new prefered means of execution. Thre is no judicial process or if there was it is secret. One the the people killed was a 16 year old boy who apparently was targetted because he was the son of someone the U.S. hated.
Obama has been he most aggressive adminstration in targetting journalists in recent history, especially ones who are telling stories the U.S. doesn't want told. Obama had a journalist in Yemen jailed for 3 years for exposing a cruise missile strike that killed civilians and interviewing Anwar Awliki.
Try bring any of the recent abuses of our Constituion to a court of law and most are shut down by State Secret privlideges. Many abuses of civil rights are currently untriable.
The U.S. pretends to have opposition parties but in fact the two parties we have are two sides of the same coin pursuing the same agenda on most issues that count, and only differing on wedge issues or where tax money is squandered. Third parties are ruthlessley suppressed, marginalized and muzzled in the U.S. especially ones which challenge the status quo.
The U.S. doesn't practice overt censorship, the U.K. is farther down this road. The U.S. favors more suble censorship and propaganda using a small number of corporate controlled media companies who do most of the shaping of public opinion. The U.S. prefers just listening to and recording what everyong is watching, reading, listening to and saying so they can spot the troublemakers.
The U.S. is actively planing for the near future when there will more terrorist attacks (i.e. 9/11), natural disasters(i.e. Katrina), protest movements (i.e. Occupy) and resource shortage shocks and when they occur they will ratchet up the police state a few more notches.
If you want an eye opener on the next generation global police state the U.S. has become grab a copy of Jeremy Scahill's Dirty Wars. U.S. special forces and intelligence are now roaming the globe engaging in largely unsupervised executions, renditions, torture and spying. This started under Bush/Cheney and Obama has actually dramatically accellerated and extended it. Some of their attacks have been very successful like killing Bin Laden, many of them are deeply flawed, killing large numbers of innocents, including women and children, and spawning new generations who hate America. The important part being they have almost no oversige from Congress or the judiciary, and often inadequate oversight from the White House and Pentagon who are running this global police apparatus.