As the Bioscope celebrates the immient arrival of its 300,000th visitor (keep on coming by folks, and tell your friends), here’s a taster for a sixty-minute documentary, Laterna Magicka, about the filmmaker Bill Douglas and his astonishing collection of pre-cinema artefects which now make up the Bill Douglas Centre for the History of Cinema and Popular Culture at the University of Exeter. The documentary has been made by Sean Martin and Louise Milne and produced by 891 Filmhouse in association with Accidental Media. It is to be included in the BFI DVD and Blu-Ray release of Douglas’ 1986 film Comrades, which features a magic lanternist as a central figure. The film, which tells the tragic story of the Tolpuddle martyrs, pioneers of British trade unionism, is released on both formats on 20 July.