This excerpt taken from the DEO 20-F filed Sep 25, 2006.
(d) UK executive share option schemes (ESOS) The last options granted under these schemes were in 1997. The group operated executive share option schemes and a supplemental scheme for senior executives. These schemes incorporated the former GrandMet scheme, the former Guinness Group executive share option schemes and the Guinness Group 1994 employee incentive trust.
Options were granted at the market price on the date of the grant and there are no performance criteria. Options issued under these schemes may normally be exercised between three and 10 years after the date granted.