First of all, there's a six-month period, when you are a minister, when you do know that you own it, before you have to divest or place something in a blind trust, a period that Democracy Watch is proposing be shortened. Second, when you first place it in that blind trust, you would still know. Third, the definition of private interest allows the minister to vote on something in which they have a financial interest as long as the matter is of general application.
On May 30th, 2006. See this statement in context.