Hilary Devey first joined the investor panel on BBC's Dragon's Den in series 9.
Hilary Devey was an English businesswoman and television personality best known for founding Pall-Ex, a palletised freight network. Her logistics background gave her particular commercial experience in transport, operations and business expansion.
She entered the programme after several earlier investor line-ups had already been established. This is why her debut is associated with series 9 rather than the show's first years.
Devey's television career included other business and entrepreneurship programmes, which can cause confusion when identifying her Dragon's Den appearance. The relevant fact here is her first regular role on the BBC investor panel, which began in the ninth series.