Peter Jones was the only original Dragon's Den investor to appear in every series up to series 20.
Jones joined the British programme at its launch and became its longest-continuing original investor. His background includes interests in technology, media, telecommunications and consumer businesses, areas that often inform his questions during pitches. His tall stature and direct negotiating style also made him one of the programme's most recognisable figures.
The original panel included several investors who later left or returned intermittently. Duncan Bannatyne, Rachel Elnaugh, Simon Woodroffe and Doug Richard were among the early dragons, but none matched Jones's continuous presence through series 20.
The wording is tied to a particular point in the programme's history: investor line-ups can change, and “original” refers to the launch-era dragons, not every investor who later joined. This is why the answer is not simply the dragon with the greatest number of appearances overall.