These are all different expressions that mean the same thing: pre-agreements or pre-contractual agreements. They can become legally binding, even if they weren`t when the trade deal was concluded, even if you don`t intend to. They are the same as terms and convention heads: a document presented in another format: letter. The term “consent in principle” gives a meaning that means that most aspects of an agreement are not binding, there is little recourse in case of non-compliance by one of the parties. Indeed, they only apply to the legally binding conditions set out above. Where a party violates these binding terms, the other party may seek an injunction, appropriate remedy, damages or a specific performance. It may sound harsh, but the fact is that most of the content of a Memorandum of Understanding (“MoU”) or a Chief of Understanding (“HoA”) is not applicable, so why spend time and money on them? Why not just go straight to the main deal? Formal and legally binding contracts must be followed by the agreement of the managers of the conditions. The second part, to which the courts have often referred, is the argument that there is too much uncertainty about the rules of negotiation (see watford vs. Miles for example). . .