The Key

A long metallic key with a broad bow, a long shank, a broad collar, and a square bit — The key in question

Those who know will know. Having this key has been a real boon to my life, and I love the country-wide incentive behind it (DRUK). It's reassuring to know that most places will have it behind the till or desk, and you can buy it cheaply online. It can be provided regardless of visible issue. Having access to a clean, well-lit place, free from other people, with plenty of space, and low traffic, is very useful.