The United Road Transport Union (URTU) men at the centre of a probe into Driver CPC training activities have had their bail extended until December.
The seven men include general secretary Bob Monks, national officer Mel Thornton and regional officers Lee Pimbley and Mike Billingham.
They were originally arrested on 15 February on suspicion of fraud by false representation.
As part of the operation a warrant was executed at URTU’s offices in Cheadle Hulme.
This is the third time the men’s bail has been extended. A spokesman for Greater Manchester Police said they are due to answer it again on 6 December.
An URTU spokesman said all the men continued to cooperate fully with the investigation.
