Taken from their filing at: https://mutuals.fca.org.uk/SocietyDetails.aspx?Number=32256&Suffix=R
Josef provided a list of clients, technologies and services in this comment on the community forum: https://community.coops.tech/t/our-new-www-coops-tech-jekyll-website/1167/10 I've cribbed the description and contact details from their website. I've assumed 2 members until I find out more.