Trade credit is when the business delays paying its suppliers. So the money it doesnt pay stays within the business, increasing the cash available. However, the more the business delays, the more chances there are of the suppliers refusing to supply further and they cannot avail the facility of cash discounts/reductions due to prompt payment.
When a business ceases to trade, the shareholders would only lose the amount they had originally invested into the business. Since the plc has limited liability, the shareholders or owners of the business cannot be held responsible for any debts of the business, hence securing their personal assets.