Research data are a valuable resource. It is University policy that all research data, including that from doctoral research, should be kept for a minimum of 10 years after completion of the project. This covers both physical and digital data. For research funded by the Medical Research Council this may be considerably longer.
These data are required to substantiate any research findings that are published or reported, so that your peers may be able to validate the findings. Sharing research outcomes also enables future researchers to open up new lines of inquiry or develop new insights based on your data, without the duplication of effort that would be needed to collect the data again, if re-collecting the same data would be feasible or possible in the first place. Increasingly, research funders encourage the sharing of data.
Thus when you get to the end of your research project, there are several things you will need to do: