 On some occasions, scenes recorded at these events are planned and edited into episodes shortly before transmission.More challengingly for the production team, some significant but unforeseen events require scenes to be rewritten and rerecorded at short notice, such as the death of Princess Margaret (particularly poignant because she had appeared as herself on the programme), the World Trade Center attacks, and the 7 July 2005 London bombings.The events and implications of the 2001 foot-and-mouth crisis required many "topical inserts" and the rewriting of several storylines.