The East Anglian Mill Society (TEAMS): http://www.teamsmills.org/
Karl Wood biography: http://tonyshaw3.blogspot.co.uk/2007/10/preface-karl-salsbury-wood-is_29.html
Lincoln Gallery: http://www.thecollectionmuseum.com/
A Spanish folk group (The Baby Factory - Moisés Torres Muñoz) produced a music video using some footage from the windmill - see here: http://vimeo.com/88676662 (1.31 in for a snippet of the mill, otherwise it's mostly the surrounding garden and village).
An interview for Liz Todd's amazing podcast series (This House) with Ben Gardiner about what it's like living in a windmill, it's history, and a few more things besides: https://www.thishousepodcast.co.uk/e/s1-ep-6-living-in-a-windmill/