A good question to ask is:
What counts as a data repository?
The answer to that depends on whether you need:
- a collaborative space to work on data during a project
- a large-scale dataset that needs to be queryable from a website
- a place to put data that you and others may cite in other research
It's worthwhile investigating the three different types of services described above before considering your obligations to Oxford University and your funding agency with regard to data deposits. But the following is a useful catch all statement:
All UK Research Councils are moving towards mandating research data archival for future access by both researchers and the public. Oxford University's Research Data Management Policy provides details of your obligations to data management and provides advice on repository selection through researchdata.ox.ac.uk. In the absence of an obvious repository, this advice refers academics to service.re3data.org/search which provides an overwhelming global registry of hundreds of data repositories and services.