The Metropolitan Police has issued a statement in response to research carried out by the London School of Economics and The Guardian newspaper.
The following is a series of extracts.
"We continue to feel proud of the overwhelming bravery of our officers who were policing the disorder in London last year.
"Since that time we have reviewed and subsequently implemented significant changes to our public order strategy and tactics. A further 1750 public order officers have been trained, policing tactics to deal with large scale disorder have been changed, and we have implemented a mobilisation plan to deploy officers more effectively which we have already tested on occasions."
"The MPS continues to investigate crimes committed during that time, and our relentless pursuit of individuals involved has seen over 2,200 offenders brought to justice."
"The MPS has always acknowledged that there were lessons to be learnt from what were unprecedented scenes of violence last summer.
"We conducted a thorough review of the events of August 2011 in order to develop a detailed understanding of the MPS response to the significant public disorder in London.
"We took learning from a range of other reviews and enquiries and shared our findings, contributing as wholly as possible to improving the capability of the MPS and partners in dealing with public disorder and criminality. We made our report public in March this year."
More top news
Newly crowned double Formula One world champion Lewis Hamilton had a phenomenal season. Here is a look at his career and season in numbers.
Four men have been jailed for their part in the murder of a legal administrator, who was stabbed outside a pub on Borough High Street.
An American man has been sentenced to life in prison after travelling to the UK in a bid to murder a woman he met through online gaming.