The same question arises though as to why it takes place in very specific localities and not elsewhere.
My argument is this could quite easily occur within a bangladeshi community, somali community etc. Its wherever there is exaggerated Islamification - a place where they are free to build there own insular ghettos free from external influences.
Currently the Pakistani community probably holds the strongest Islamic identity because thats why it was formed & it has large enough numbers to sustain itself in this loop of paranoid scizophrenia.
Lets say one possibility that its the extreme insularity that in particular Mirpuri culture inculcates
Within the Pakistani community there are higher & lower levels of education. Those that came from rural Pakistan vs those that came from the city. Again Islamic influence will be greater or lower depending on the number of books they have read outside of Islam.
regional background of the majority of the convicted
In London things are different because there may be more education, variance of cultures, less poverty, more jobs etc.
In fact, hopefully the Home Office is doing exactly that kind of research as we speak.
If they need to deal with the problem, they should concentrate on Islam (UK) plc