The only details I can find pertaining to the deal are
"Mergermarket reported that the deal would mimic its investment in south London brewery Brixton, which saw it take a 49% stake in the business to fund a move to a larger site. The brewery had researched other investment options, such as crowdfunding or private equity, but these were dismissed as “unsuitable.” Plant was at pains to reassure Beavertown’s loyal following that Heineken “do not want us to conform or change.” “They love what we do and want us to do more of it. “That support gives us the opportunity to maximise what we do best and support our partners and team along the way to achieve and grow together. “The only change will be the building of Beaverworld, hopefully with completion and beer flowing by late 2019.”"
Couldn't find any mention of a 100% deal in time, or is that just speculation?
Speculation but all of Heineken’s other acquisitions have been 49% initially then 100%
Else why would Heineken care about a minority stake in a business turning over <£100M if they weren’t eventually going to take full control