The original British series of Dragon's Den launched on BBC Two.
BBC Two was the programme’s home when the UK adaptation premiered in 2005. The channel has traditionally carried factual, documentary and specialist entertainment programming, making it a natural fit for a business series built around entrepreneurship, finance and negotiation.
The programme’s later success made it one of the BBC’s best-known business-entertainment formats. Its appeal extends beyond investment advice: viewers also watch to assess pitching technique, valuation claims, product design and the chemistry between the entrepreneurs and investors. The channel association is therefore part of the programme’s basic broadcast history.
BBC One is an easy source of confusion because it is the BBC’s main general-entertainment channel and has broadcast many major factual series. BBC Three and BBC Four are also BBC channels, but neither was the original launch home of the British Dragon's Den series. The specific answer is BBC Two.