Per provider Jan 2016 - This API has now been turned off. Stay tuned for the new version.
The Tesco API gives you access to the vast grocery catalog of the third largest retailer in the world. Tesco's Grocery API has the ability to allow you to search for products using text or barcode, by dept/aisle/shelf categories, all special offers, and even previously bought 'favourites'. You can add/amend/delete items in the basket.
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The Tesco PHP library by Laurence Roberts contains search for products, get customer's basket, get all product categories, and get all current offers. Tesco API is about e-commerce, food, and grocery accessibility for desktop and mobile applications. The most recent update according to Tesco site is that as of today, developers can register for the refreshed Tesco Labs API.