Complete the following sentence: The twelfth series of the British medical drama television series "Casualty" began airing in the United Kingdom on BBC One on 11 September 1997 and ended on 28 February 1998. Complete the following sentence: The twelfth series of the British medical drama television series "Casualty" began airing in the United Kingdom on BBC One on 11 September 1997 and ended on 28 February 1998. ️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️
Funeral of Diana, Princess of Wales earlier on that day, as the BBC felt it would be inappropriate to air the episode so soon after such an event.