A number of dangerous inmates at Feltham prison have repeatedly attacked staff over a one year period.
Exclusive data revealed at least five prisoners were recorded for serially assaulting prison guards at least four times in 2015, at HMP Feltham on Bedfont Road, Feltham.
Getwestlondon requested details of how many times the most violent convicts attacked staff at institutions including Feltham Young Offenders from the Ministry of Justice.
A prisoner at nearby HMP Bronzefield in Ashford was responsible for five of 29 attacks on staff at the prison in the same year.
The unnamed inmate committed more attacks on staff that year than any other prisoner at the Category A adult and young offender female's prison in Shepperton.
She was among the most dangerous inmates anywhere in the prison system - only 15 individual prisoners lashed out at staff more often in England and Wales.
Another Bronzefield prisoner attacked staff three times that year.
At least five prisoners at HMP High Down in Sutton made two assaults each.
In terms of the number of attacks on staff, the most dangerous prisoner was at HMP Winchester in 2015.
The Ministry of Justice has said it is to boost frontline officers by 2,500 as part of a £100m investment.
The announcement was made by Justice Secretary Elizabeth Truss on Wednesday (February 8), and will launch in April this year.
A Prison Service spokesman said: "We do not tolerate any violence against the dedicated staff that work with our offenders.
"When incidents like this occur we work closely with the police to push for the strongest possible punishment.
"We are reforming our prisons and have taken immediate action to tackle the drugs, drones and phones that undermine security. We are also investing £100m annually to boost the front-line by 2,500 officers.
"These are long-standing issues that will not be resolved in weeks or months but our wholesale reforms will lay the groundwork to transform our prisons, reduce re-offending, and make our communities safer."
Safety in custody statistics for 2016 are expected to show another record high in assaults on prison staff.
In 2015 there were 4,963 assaults on staff in England and Wales.
Between October 2015 and September 2016 there were 6,430 - making it very likely that the full total for 2016 will be more than the record high set the year before.
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