If you have given an enforceable undertaking, you can withdraw or change it at any time, but you need the Director's written agreement. You can either withdraw the whole undertaking or vary some of its provisions. The undertaking's provisions can be changed, but not to relate to a different alleged breach of the Civil Aviation Act or its regulations and rules. The Director must put a notice on the internet about any withdrawal or variation of an enforceable undertaking, which will be on a website maintained by or on behalf of the CAA, you can also compare this to the 2015 legislation.