Im producing a 10min or so documentary on a nightclub / dance music brand (decided after their budget had been set). They want to do some sort of profit share, the video will be sold on their online store (where they sell digital downloads etc).. I need to get something in writing before i release any video - probably a straight 50/50 share. Are there any good sources for 'sub contractor / sole trader fee share' contracts templates ? apart from 'business in a box' which seems to only have USA based contracts. - need uk only. Or maybe good overall sources that have templates for most business needs such as employing others, production management templates?