Sources said the agency wanted to know details of alterations done in the helicopter specifications.
Former Air Chief SP Tyagi denied all the allegations against him and contended that laid down procedures were followed for the deal for 12 VVIP helicopters.
The team had gone to Italy a week ago to request for assistance in probing the alleged role of Indians in the Rs 3,600 crore VVIP chopper deal.
India's High Commissioner to the UK says the British government is closely watching the developments and waiting for the completion of Italian investigations in the AgustaWestland defence deal.
According to the factsheet, a global tender was floated in 2002 for helicopters. Only Eurocopter, France, was found suitable for acquisition.
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