In the news today, one of the senior police commanders from the G20, Bob Broadhurst, has been caught out in lies he told to Parliament in the aftermath of that operation. From the Guardian (emphasis added):
Responding to previous reports that plain-clothes officers were deployed at the G20 protests last year, Commander Bob Broadhurst, who runs the Met's public order unit CO11, told a parliamentary committee in May last year: "The only officers we deploy for intelligence purposes at public order are forward intelligence team officers who are wearing full police uniforms with a yellow jacket with blue shoulders."
In a statement this week, the Met said plain-clothes officers were frequently deployed in "day to day" policing. "It is key that as a police service we observe and gather information to provide us with a relevant and up-to-date intelligence picture of what to expect in terms of protest groups and public order policing."
I can only assume that if a normal person lied to a Parliamentary committee that would be considered a bad thing. I'm also going to go out on a limb here and assume that absolutely nothing will happen to Commander Broadhurst and his career prospects as a result of this lie.