CBI sources said they have been informed that hearing in the case has been deferred till October but no reason has been given.
Shankaran, kin of former Naval Chief Arun Prakash, was arrested in London in May last year on the basis of an Interpol Red Corner notice secured against him by the CBI which has pressed for his early extradition to India.
A retired Naval Commander, Shankaran was accused of smuggling sensitive classified information out of the Navy War Room and passing them to arms dealers.
The CBI had dispatched a two-member team to London to assist British law officers in the extradition trial. It also furnished a 50-page reply to objections raised by the defence on emails submitted as evidence in the court.