The Prison Service said all its prisons run a "safe and secure regime" after disturbances broke out at two jails yesterday.
A spokeswoman said:
All our prisons run a safe and secure regime and are staffed appropriately.
We are currently introducing reforms to the prison system that will provide better value for taxpayers while protecting the public and improving the chances of prisoners being rehabilitated.
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The report also said that many graduates do not even see a 'earnings premium' from their years at university.
The country's counter-terrorism forces have regained control of the facility.
The commissioner of the Metropolitan Police has said he cannot promise the public an attack will not take place.