SCOTLAND Yard's senior anti-terrorism officers are reviewing the `threat profile' of potential terrorists in the wake of the London bombings.
They have taken action after admitting that the four July 7 suicide bombers - all from West Yorkshire - did not conform to the profile as it existed before the atrocities.
And that meant that no warnings of the attack were picked up by the police or intelligence services.
Senior officers are investigating the backgrounds of the four bombers, to discover how, when and why they became radicalised to the point where they were prepared to kill themselves and dozens of innocent people for their cause.
Mohammad Siddique Khan, of Thornhill Lees, the suspected ringleader of the July 7 murder gang, said in a suicide video message he was "protecting and avenging my Muslim brothers and sisters".
Police are anxious to avoid creating a stereotype of a typical terror suspect, for fear that extremist groups could use recruits who do not fit the profile to mount their attacks.
But as a result of the July bombings and other anti-terror operations this year they have begun to look again at the influences which lead young British men into accepting terrorist doctrines.
A source said: "There were things learned from July and other operations that have happened since that are informing our thinking.
"There is work being done about how, when and why people are radicalised."
Once the Scotland Yard review is complete it will be used to inform future counter-terrorism strategies aimed at preventing a repeat of the London blasts.
The police are also calling for a huge increase in manpower and cash to combat suicide terrorism.
A further three attempted terrorist attacks have been thwarted since the London bombings, says Metropolitan Police Commissioner Sir Ian Blair.
Most of the extra resources for national security, to be allocated next year, will be given to the intelligence services, say reports.
Of the £135m to be distributed, £85m is expected to go to MI5 and MI6, with the remaining £50m being split between various agencies.
Scotland Yard believes it needs all that money to recruit more officers by the time new anti-terrorist measures are in place.
The Met argues there needs to be a balance between the intelligence and investigative side of the approach to combating terrorism.
It was revealed recently that the number of anti-terror operations had increased by 75% since July 7 and that police now receive high grade intelligence reports on a daily, rather than monthly, basis.
A Scotland Yard spokeswoman said: "The Metropolitan Police have made a significant bid to the Government for extra growth within counter-terrorism and we continue to be involved in constructive dialogue with the Home Office."
A Home Office spokeswoman said a record amount of cash was available for policing terrorism.