I am on ESA and once a year in July I take out a budgeting loan of £812 to pay for my kids uniforms. The amount is paid back fully through deductions in future payments but it's zero percent interest and the only was I can get a bulk amount to cover all school expenses.
If you get moved to universal credid you can no longer get a budgeting loan.
Yet another reason I'm terrified of getting the letter saying I'm being moved over.