Four Islamic extremists admitted plotting a terrorist attack on British soil armed with guns and home-made bombs.
The men were caught after in a massive multi-million pound surveillance operation by police and the security services.
Hidden bugs recorded them discussing methods, materials and targets for a terrorist attack, including using improvised explosive devices.
they were arrested at their homes in Luton, Bedfordshire, following a huge operation by the police and the security services.
The men involved were Zahid Iqbal, 31, Mohammed Sharfaraz Ahmed, 25, Umar Arshad, 24, and Syed Farhan Hussain, 21.
They admitted a single terrorism charge at high-security Woolwich Crown Court just weeks before they were due to face trial.
The court was told the offences took place between January 2011 and April last year. All four men are of Pakistani origin.