Since August 2012, any ADS shares retained from an Executive plan, will have been transferred to Citibank NA and registered in the shareholder's own name on the DRS, which is administered on behalf of Diageo plc ('Diageo') by Computershare Investor Centre (a division of Citibank).
You can view any holding and manage your account online through Computershare Investor Centre. Log on to their website here and follow the instructions to create your secure account. You will need your Holder Account Number in order to log in to the service.
Please contact Citibank Shareholder Services toll free at +1 866 253 0933 if calling within the US or +1 781 575 4555 if calling from outside the US.