Police only managed to catch the EDL terrorist attack plotters because a traffic officer impounded their car because it was uninsured.
A traffic officer stopped Jewel Uddin and Mohammed Khan on the M1 as they travelled back to their home town, Birmingham.
Checks were made on their Renault Laguna, which came up as being uninsured, and so the car was impounded.
It was only two days later that staff at the pound near Sheffield looked at the contents of the Renault and found the gang's arsenal.
Six Islamist extremists have been sentenced to between 18 years and 9 months and 19 and a half years at the Old Bailey in London.
The sentencing of six men who planned a murderous attack on an English Defence League rally in West Yorkshire is due to continue.
A plot by six men from Birmingham to attack an EDL rally in Dewsbury was uncovered by "pure chance", police have said.