Deborah Meaden joined the Dragon's Den panel in 2006.
Meaden is a British businesswoman and investor who became one of the programme’s most recognisable Dragons. She is associated with businesses in leisure, retail and tourism, and she is known on the show for concentrating closely on figures, margins and the practical route to growth.
Her arrival came after the first series, so she was not part of the original launch panel. That timing is important because the programme began in 2005, while Meaden joined in 2006. Her long association with the series has made her a familiar face to international viewers.
Meaden is sometimes confused with later female Dragons such as Kelly Hoppen or Sara Davies. Those investors joined during different periods. The question asks specifically about the businesswoman who entered the panel in 2006, making Deborah Meaden the single answer.