Crown Prosecution Service denies it blocked publication of material and says decision rests with the government

Downing Street is under pressure to publish its evidence in the collapsed China spy case after the Crown Prosecution Service denied having blocked its release.

Keir Starmer is likely to come under scrutiny at prime minister’s questions on Wednesday after the CPS said it was up to the government to release the evidence.

The government has faced mounting pressure over its handling of the collapsed trial of Christopher Cash, a former parliamentary researcher, and Christopher Berry, a teacher. Both men, who deny wrongdoing, had been accused of passing secrets to China, but charges against them were dropped last month.

The latest row came after sources within No 10 claimed Chris Wormald, the cabinet secretary, had gone to the CPS to discuss the publication of a witness statement central to the withdrawal of espionage charges against the two British men.