ANSWER
If you are buying large quantities of one particular product or we are down to the last few units we will alert you on the basket page of the amount you are able to buy by displaying the message You have requested quantities for a product that exceeds our stock level. Please reduce the amount or remove the items and try again. If you see this message, please reduce the quantity to continue with your purchase.
We may introduce maximum levels on products which are on offer to enable more of our customers to benefit from the deals available. You will be prompted at the checkout to reduce the quantity to the amount specified.