Not all the products require a 50% deposit, only some of the higher-priced items that require a deposit to start the manufacturing process. It is not a general message to be applied to the cart across the whole shop, but only on selected products, where I would like to output something along these lines:
Name	 	Price
Flyrod		£ 500.00
Total			£ 500.00
50% deposit	£ 250.00
And have the deposit amount be the amount applied at checkout. My PHP skills are pretty poor... is there any assistance you can give here?