Free guided tours of Parliament are available to constituents. The walking tour of the Palace of Westminster includes -

• Westminster Hall, the ancient hall at the heart of the Palace where Parliament first sat and where many historic events have taken place
• The House of Commons, including the Speaker's Chair and the famous green benches and the 'lobbies' where MPs actually vote
• The House of Lords, including the Royal Throne
• The Queen's Robing Room, Royal Gallery and many other fascinating parts of the Palace of Westminster

Please note that tours are very popular and places are limited so should generally be booked about six months in advance.

See http://www.parliament.uk/visiting/visiting-and-tours/tours-of-parliamen… for more details