The Financial Regulations specify that it is the Head of Department's responsibility to ensure that all trust funds are maintained in credit.
See also the guidance for Trust Fund Managers [1]
Links[1] https://universityofcambridgecloud.sharepoint.com/sites/FINANB_FinanceLearningHub/Published%20documents/Forms/AllItems.aspx?id=%2Fsites%2FFINANB%5FFinanceLearningHub%2FPublished%20documents%2FBPG4%5FGuidance%20for%20trust%20fund%20managers%2Epdf&parent=%2Fsites%2FFINANB%5FFinanceLearningHub%2FPublished%20documents