When you are at the "Basket" stage of processing your order, you will be able to see the current stock levels,
As per the below image: 

  • Items in-stock with next day delivery will be highlighted in BLUE
  • Items with part stock will be highlighted in RED with the available quantity
  • Items NOT in stock will be highlighted in RED with 0 in the quantity box

PD-Check-Stock

If you are looking for further information about expected delivery dates you can click the blue i icon, in the "options" column of the basket
This will display extending stock information as shown below:

PD-Stock-Info