HCOTEG22250 - Law - background: Legal roles and responsibilities You should check the other guidance available on GOV.UK from HMRC as Brexit updates to those pages are being prioritised before manuals. Introduction In searching any part of the law or its provisions, it is important to identify correctly the roles and responsibilities of those persons or legal entities involved, and to understand their respective obligations under the legislation. In order to hold someone in breach of the legislation or regulations, they must first be mentioned in law and be held to be responsible for fulfilling some requirement in the legislation.