The award winning rescue documentary Lion Ark – the story of the dramatic rescue of twenty five lions from circuses in Bolivia – returns to London for a free screening at the Royal Horticultural Halls this Saturday, August 19. The acclaimed film, which will be followed by a Q&A with the filmmakers and rescue team leaders, forms part of This is our world, a charity event raising awareness about wildlife and conservation through a unique collection of life-size paintings and series of talks.