Freelancers Co-operative?

Hello all, its Rhiannon from AltGen- excited to be introduced to the world of Loomio!

So AltGen is about to come to the end of its year project with Co-ops UK helping young people set up worker co-operatives. Alongside developing and building this network of young co-ops we are setting up a co-operative of Freelancers from different sectors. I know there has been a lot of discussion on a previous thread around co-operative consortia/ LLPs/ worker co-ops for a business of people working together in the same sector. However we are interested in something much broader that provides space, services and mutual support for a wide range of freelancers in the social & creative sphere. We have been looking at the Bread Funds in Holland that provide sick pay for freelancers, Coopaname in France that 'employs' 700 individual people working in different areas and provides them with shared space, accounting legal, status of employee (more beneficial in France than here) and a community that works together and bids for projects. The final model we have been looking at is Smart Belgium an organisation of 60,000 creative freelancers that pay a % of their income for support with legal, admin and invoicing services. We are bringing a version to the UK that combines examples of best practice across Europe. What combination of options do people think would be valuable and viable as a co-op business? What is most relevant to freelancers as well as the co-op values? What do you think would be legally viable in the UK?

Thanks in advance!