If something has happened which an MP believes requires an immediate answer from a Government Minister, they may apply to ask an urgent question. If the Speaker (or in the House of Lords the Lord Speaker) agrees that the matter is urgent and important, the question will be asked at the end of question time.
Applications for urgent questions must be submitted to the speaker to receive an oral answer on the same day. Relevant interests must also be declared. The relevant Government department will be asked to provide a background briefing on the issue for the speaker.
Urgent questions are asked straight after question time on Monday to Thursday. If an urgent question is asked on a sitting Friday then the question will be asked at 11am.