They started using the 'Defender' name in around 1991 to distinguish it from the Discovery as I recall. There are some electronics that pre-date the TD5. The TD5 inherited the immobiliser from the TDi period - that green box that lives inside the dashboard. Not that it's very sophisticated (or even very good).
It was a typo, they meant to call it the Defective, but a secretary transcribed it wrong! ;) :D
 

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