The shuffle is the term used for the ballot to decide which questions will be asked during Question Time in the House of Commons. At Question Time there is only enough time for 15 to 20 questions to be asked, but more that 70 questions are usually tabled. At the ballot or shuffle the questions are drawn out one by one to determine the order in which they will appear. It is therefore very important for an MP to have his or her question drawn out at the beginning rather than at the end. In recent years the shuffle has been mechanised and the House has decided to only include a certain number of questions on the Order Paper rather than all of them as was the case before.
Further information on this subject can be found from the following link.
About Parliament: Question Time