Husband and wife Harry and Laura Marshall, 57 and 56, founded this firm in their basement in Bristol in 1990. It makes documentaries, natural history and factual entertainment shows for the BBC, ITV, Nat Geo Wild and the Discovery Channel, with commissions including Desert Seas, which was narrated by Sir David Attenborough. The success of Icon’s River Monsters shows — the highest-rated series for the American channel Animal Planet — helped exports reach £9.1m last year.
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