2 Entertain ; BBC ; BBC Earth ; a BBC/Discovery Channel/France Television co-production ; series producer, Dale Templar ; executive producer, Brian Leith ; BBC Productions Bristol/Wales
a BBC/Discovery Channel co-production in association with Wanda Firms ; series producer, Karen Bass ; produced by Justin Anderson, Peter Bassett, Joe Stevens, Hugh Pearson and Jeff Turner
British Broadcasting Corporation ; series producer, Huw Cordey ; produced and directed by Mark Brownlow, Jonathan Clay, and Chiara Bellati ; a BBC/Discovery Channel co-production