Which British Dragon left Dragon's Den in 2014 after appearing as an investor?

Duncan Bannatyne left the British series Dragon's Den in 2014.

Bannatyne, a Scottish entrepreneur and philanthropist, was one of the programme's most recognisable early investors. He joined the original British Dragons' Den panel and became associated with direct questioning, business experience and a strong interest in the figures behind each proposal.

His business career included health clubs, hotels and care homes, and he also became known for charitable work. His departure marked the end of a substantial period as a regular Dragon, although the programme continued with other investors.

The year can be confused with the arrival dates of replacement Dragons. The programme has changed its panel repeatedly, so a Dragon's joining year is not necessarily the same as another Dragon's departure year. This question refers specifically to Bannatyne's exit from the British television series.