If you pay for the fuel used in your company car you are entitled to recover the cost of the fuel – for business journeys - based on agreed Advisory Fuel Rates (AFRs), from your employer.
If your business processes materials or assembles goods for sale it will usually need to keep a stock of items to ensure that future sales can be met.
If you decide to employ students to assist with your staff needs over the summer, you will need to add them to your payroll and apply PAYE and NIC rules.