This excerpt taken from the ICI 6-K filed Mar 21, 2007.
Restricted Share Plan
Awards under the Restricted Share Plan are made to a small number of senior executives below the level of the Executive Management Team. The length of retention period before awards vest is flexible, and may vest in annual tranches. The scheme involves awards of ICI shares or, for US-based participants, ADRs, with the release being conditional upon achievement of certain conditions which vary by employee.