UCL has a policy on research data that explains how data should be managed and shared by staff and research students. The emphasis is on making data as openly available as possible, with caveats that commercially sensitive material or personal data protected by law should be kept safe. Read the full policy here:
If you are funded by a UK research council or other funding agency then you may also have to comply with the data management and sharing expectations of that organisation in addition to the UCL policy.