Documentary exploring how the supermarket chain keeps customers coming back for more, shedding light on how Aldi manages to sell its products at bargain basement prices. Bez from Happy Mondays tries out Aldi beer and Jason Manford's brother Colin tests out its own-brand ketchup, and there is a visit to Leicester-based bakery Gearys, who supply Aldi's in-store products.

Tesco is the most successful supermarket chain in Britain. With around 3000 UK stores, it is the largest private sector employer in the UK.

With access to one of their largest stores, we spend 24 hours in Tesco to reveal the secrets behind this juggernaut's success. From finding out tips and tricks from Tesco staff to revealing the ingenious hacks to help you shop smarter.

We look at the history of Tesco and its founder Jack Cohen, the development into online shopping and deliveries, as well as finding out what happens in store from the moment they open their doors at 6am. This whirlwind of activity that keeps them at the top of the supermarket chain.

Behind the scenes of DNATA, the UK's largest in-flight caterer, where 24,000 meals are prepared from scratch every day for passengers on flights travelling across the world. The show delves into a world where food behaves poorly on board and not every component can make the cut, and where dish design takes months and must pass muster with airlines.

The secrets of the online fashion retailer, with insiders and experts revealing how it has become a global clothes-selling powerhouse in just two decades. The programme uncover how its hi-tech website works and shows how it encourages shoppers to spend and delivers discounts by tracking their preferences, and looks at how the company took on traditional fashion chains and even bought up some of the High Street's biggest brands to become one of the UK's fastest-growing businesses.

The secrets of the fast-food delivery chain, which has nearly 1,200 outlets in the UK and supplies in the region of 100 million pizzas every year. This documentary goes inside the kitchens and behind the scenes of this pizza empire to meet staff and see first-hand how the pizzas are prepared and cooked, and there is access to one the business's distribution centres.