Surgical apparatus tray inserts and trays

An insert for a surgical apparatus tray comprising:

• an upper part defining at least one support configured to receive an item of surgical equipment, the upper part defining a first plane and the upper part having a plurality of edges defining a polygonal shape of the upper part;
• a first side wall extending downwardly from a first edge of the upper part and defining a second plane, the first side wall having a first attachment feature, and wherein the first attachment feature is a male attachment feature;
• a second side wall extending downwardly from a second edge of the upper part and having a second attachment feature, wherein the second attachment feature is a female attachment feature having a form, and wherein the first attachment feature is configured to mate with and lock to the form of the female attachment feature of another insert when the first side wall is moved in a direction parallel to the first plane and the second plane to connect the insert to the other insert having a similar construction;
• wherein the male attachment feature includes a locking part configured to interact with the form of the female attachment feature of the other insert to lock the male attachment feature to the female attachment feature when mated, the male attachment feature including a central body portion defining a circular aperture and a tongue at a free end of the male attachment feature connected to the central body portion by a spring and narrower tail located at another end of the central body portion and inclined relative to the body.