Is 8 inches standard for a chef's knife?
Kitchen knife
Also known as a cook's knife or French knife, the chef's knife is an all-purpose knife that is curved to allow the cook to rock the knife on the cutting board for a more precise cut. The broad and heavy blade also serves for chopping bone instead of the cleaver, making this knife the all purpose heavy knife for food preparation. Chef's knives are most commonly available between 15 cm and 30 cm (6 and 12 inches), though 20 cm (8 inches) is the most common size.
Gordon Ramsay Plane Food
As with all restaurants at Terminal 5, Plane Food cannot use gas equipment due to safety reasons and so electric ovens and hobs are used instead as well as a single microwave. The cutlery is also a standard airport size so that the knives cannot be used as weapons. Ramsay requires that staff who are working at Plane Food must gain work experience in another one of his restaurants first.