The Criminal Law Act 1977 (CLA 1977) provides: 'Subject to the following provisions of this part of the Act, if a person agrees with any other person or persons that a course of conduct shall be pursued which, if the agreement is carried out in accordance with their intentions, either—

1. will necessarily amount to or involve the commission of any offence, or
2. would do so but for the existence of facts which render the commission of the offence or any of the offences impossible, he is guilty of conspiracy to commit the offence or offences in question.'