It may be a question of privilege. There are various solutions open to the members, but it sounds to me like a debate as to what happened in Bonn, which is not the subject of a question of privilege in this House. There are opportunities for late shows and there are opportunities for opposition day motions on subjects like this, but when questions are asked it is not for the Speaker to control the answers.
In the House of Commons on May 17th, 2006. See this statement in context.