The original name of Institute of Legal Executives (ILEX) was established in 1963 with the help of the Law Society of England and Wales to provide a more formal process for training so-called "solicitors' clerks".

Traditionally, solicitors' clerks were not formally trained in law, but through experience had built up a working knowledge of specific aspects and could carry out legal paperwork as a fee earner.

On 13 October 2011 the Institute of Legal Executives (as a company limited by guarantee) sought royal charter status[3] from Queen Elizabeth II via the Privy Council.

CILEX has more than 17,000 members,[6] all eligible to use the appropriate designatory letters depending on their membership grade and demonstrating their commitment to professional and ethical standards in the legal profession.

This is to continue following their professional and legal duties, plus their compliance required by CILEX Regulation.