2008 Playing Rule 18 e:In the handbook this rule continues to indicate that, 'Batsmen are to retire NOT OUT after scoring 25 runs.'This is incorrect!
The new rule states: 'Batsmen are to retire NOT OUT after scoring 30 runs.Batsmen may return in the order that they retired to continue their innings [until the innings is completed or they are dismissed] when there are no longer two batsmen who have not been dismissed or retired.'