Pro Bono Economics (PBE) can provide charities with pro bono support from a dedicated volunteer economist to help them with their ad hoc data needs. That might include data analysis or visualisation, spreadsheet tasks or short pieces of research.
This free to use service is open to any charity, community group or social enterprise with a presence in the UK can apply for up to 5 days of support in a 5-month period courtesy of this service.
The process essentially allows you to outline the task you are looking for support with and the service them will post details of this to its membership of over 900 qualified economists to find you the best match for your needs.