The Special Patrol Group was a crack unit of the Metropolitan Police who specialised in public order offences from 1965 until 1986, when, after beating Blair Peach to death and being found in possession of illegal weapons, it was punished by having its name changed to the Territorial Support Group (TSG). Now it finds itself in slightly lukewarm water after one of its members made an unprovoked assault on Ian Tomlinson, contributing to his death, and another for hitting a woman first with his hand and then with his baton.
A rational government that upholds the rule of law and values the people as the ultimate source of power in a democracy would order a thorough review of the TSG. In particular, they would view all the CCTV and citizens' footage of the G20 demonstrations, to observe the behaviour of the TSG, who are identifiable from the blue markings on their shoulders and upper chest. In particular, they would look to see whether their interventions quelled angry crowd behaviour or had the opposite effect.
Members of the unit would also be screened by being hooked up to a polygraph and exposed to images and key words to see if they respond to right wing triggers.
As things stand in UK plc 2009, the best we can reasonably expect is a change of name for the unit. Suggestions in the comment slot please.
[Update 7 Nov 2009: Guardian: Culture of Impunity at TSG, 5000 complaints, 0.18% upheld. I rest my case.]