Compare the complete shopping basket

1. Write down the exact item, size, quantity and accessories you need. Use the same list for each shop so the comparison stays consistent.
2. Add the listed delivery charge and any required accessory to each basket total. Note collection separately if it means another journey.
3. Compare matching quantities. For packs of different sizes, divide the price by the number of usable units and record that unit beside the result.

Check the final checkout screen before ordering. A discount requiring extra purchases is a different basket, so compare it separately.