We're on the neo4j start-up programme with our R!SK Hunter product (identifying fraud and mis-selling in UK financial services) and opening up our data to others in the community under thegraphproject.com banner.
We maintain a neo DB of all UK companies and company officers (both active and past, some 25m nodes) which is updated daily (around 20k records changes). The model is rich with location and temporal data and we're working on entity resolution to normalise for a really robust up to date offering. To date 56m nodes, 180m rels.
We're proposing offering free access (to a few users initially) who have a commercial or research project which needs UK company data. In return, we just want to understand what problem you're working on and collect data on your use, queries, etc. Access will be via the neo browser.
If you're interested reply to this thread (update: there is now a 'Request Access form at the site, but handy if you can post a summary here for others in the community to see what's happening)
(our product site https://riskhunter.co.uk/)