Which Dragon's Den investor left the BBC programme after its twelfth series in 2014?

Duncan Bannatyne left Dragon's Den after its twelfth series in 2014.

Bannatyne is a Scottish businessman and philanthropist whose commercial career included care homes, health clubs and hotels. He became one of the original dragons when the British programme began in 2005 and remained on the panel for twelve series.

His departure preceded a new phase in the show’s casting. Nick Jenkins joined the panel for the thirteenth series, while Peter Jones continued from the original line-up. Because Bannatyne was present for so many early episodes, viewers sometimes remember him as a permanent investor rather than as a former one.

Bannatyne's business background is also distinct from that of fellow early investor Theo Paphitis. Bannatyne built the Bannatyne Group, particularly through health clubs and care services; Paphitis is associated with retail brands such as Ryman. The question refers to the British television programme, not to an investor's withdrawal from a specific deal.