Without the testimony of 'Supergrass' Mohammed Junaid Babar at the Crevice trial, would there have been enough evidence against these men to merit the 40 year life sentences they received? Especially given the statement read on behalf of these men at the end of the Crevice trial explicitly denied that there was any plot to attack the UK:

This was a prosecution driven by the security services, able to hide behind a cloak of secrecy, and eager to obtain ever greater resources and power to encroach on individual rights.

There was no limit to the money, resources and underhand strategies that were used to secure convictions in this case.

This case was brought in an atmosphere of hostility against Muslims, at home, and abroad. One stoked by this government throughout the course of this case.
This prosecution involved extensive intrusion upon personal lives, not only ours, but our families and friends.

Coached witnesses were brought forward. Forced confessions were gained through illegal detention, and torture abroad. Threats and intimidation was used to hamper the truth. All with the trial judge seemingly intent to assist the prosecution almost every step of the way.

These were just some of the means used in the desperate effort to convict. Anyone looking impartially at the evidence would realise that there was no conspiracy to cause explosions in the UK, and that we did not pose any threat to the security of this country.
It is not an offence to be young, Muslim and angry at the global injustices against Muslims."

J7: 7/7 Inquests Blog: A cat amongst the [stool] pigeons - Mohammed Junaid Babar