How much would it cost to pack supermarket groceries for shipping?

The fee to pack groceries into boxes for shipping is chargeable at £7 for the first 25 quantity of items. Thereafter, it is £5 per 25 quantity of items. There is additional fee of £0.50/item to pack fragile and liquid containing goods. 

The fee exclude shipping cost. Please also see other relevant questions about ordering groceries here.