The Archives Hub is a union catalogue that holds over 20,000 archival finding aids from 150 institutions. It provides a search interface for academics and students to discover archival collections throughout the UK. The service is funded by JISC but free to access by all. Responsibility for creating descriptions lies with the contributing institutions, who structure their data according to archival XML standards. The development of a software called Spokes now allows institutions to host descriptions locally while still being part of the distributed Archives Hub service.