Build services that are flexible enough to allow users to give data in a way that they would naturally. For example we should allow users to enter a postcode in upper or lower case, with or without a space.

Validation errors should only be triggered on mandatory fields. They must be factual and help the user move on.

More detailed information on how to use <a href="https://coop-design-manual.herokuapp.com/styles/forms/index.html">form patterns can be found in our design guidance</a>.