RHS Chelsea Flower Show Guest cast, played by Mark Lane Episode 2021-09-20: Episode 2 (Sep 20, 2021) Episode 2021-09-20: Episode 4 (Sep 20, 2021) Episode 2023-05-24: Episode 5 (May 24, 2023) Episode 2023-05-25: Episode 8 (May 25, 2023)