Petty cash
Small items purchased by cash, cheque or debit card can be reimbursed from petty cash, providing that the sum is less than £30 (please note, credit card transactions cannot be reimbursed via petty cash). A receipt is required in all cases. For items greater than £30, please use your local purchase ordering system. Alternatively, a request can be made for reimbursement via the expenses claim form.
A list of allowable expenditure to be reimbursed via petty cash can be found here