Peter Jones has appeared in every UK series of Dragons' Den since the programme began.
Jones is a British entrepreneur and investor who joined the original panel when the British version launched. His business interests have included telecommunications, technology, retail, leisure, and media. On the programme, he is known for assessing the commercial potential of products and negotiating equity terms.
Several other well-known Dragons have served on the panel, but they did not remain throughout the entire British run. Duncan Bannatyne, Theo Paphitis, and Deborah Meaden are prominent former or current figures associated with particular periods of the show, making them common alternatives in this question.
The claim concerns the UK television series, not every international edition of Dragons' Den. It also refers to series appearances, rather than every episode or every special. Jones's continuous presence is one reason he is often regarded as the programme's longest-serving Dragon.