The first time a newly elected MP speaks in the Chamber of the House of Commons is known as a maiden speech. By tradition, the Member is called ahead of other MPs who may have indicated their wish to speak at the same time. A maiden speech is usually uncontroversial, fairly short and contains a tribute to the MP's predecessor and favourable remarks about the constituency. It is also a tradition that a maiden speech is heard without interruption and for any speeches that may follow, to praise the new MP's first contribution. In the House of Lords a Member making a maiden speech will do so in a debate with a speakers' list so that the House and, in particular the next speaker, may know that conventional courtesies apply. The maiden speech is expected to be short and uncontroversial and would not express views that would provoke an interruption.
Further information on this subject can be found from the following links.
By-elections since the 2010 General Election
Maiden Speeches 1979 Onwards
Maiden Speeches 1945 - 1979
Maiden speeches in the House of Lords