I am not aware of any "authority" on that point as it is simply an opinion and IANAL.
Currently, as far as I am aware, there are no specific binding legal precedents directly addressing the scenario where a PPC sends an NtH despite incomplete compliance by the hire company with the PoFA. However, there are general legal principles and related case law that can provide persuasive arguments supporting the idea that by sending the NtH, the PPC may be considered to have accepted the transfer of liability based on the information provided.
Estoppel is a legal principle preventing a party from asserting something contrary to what is implied by their
previous actions or statements. In this context, by sending an NtH to the hirer, the PPC could be seen as representing that the transfer of liability was accepted. If the PPC later tries to claim that the transfer was invalid due to missing documents, the hirer or the hire company could argue estoppel, asserting that the PPC’s initial action of sending the NtH estopped them from pursuing the hire company again.
Waiver is the voluntary relinquishment of a known right. By sending the NtH to the hirer, the PPC might be viewed as having waived their right to demand full compliance with PoFA from the hire company, especially if they acted on the information provided and attempted to hold the hirer liable.
In contractual and procedural law, actions taken based on received information implies acceptance of that information as satisfactory. If the PPC acts on the hire company's notification by sending an NtH, it may be argued that they have implicitly accepted the notification as sufficient for transferring liability.
While I can't find any direct binding precedents that specifically address this exact scenario, there are some related cases in the realm of civil procedure and estoppel that may offer persuasive value:
J. Murphy & Sons Ltd v. Johnson Precast Ltd [2008] EWCA Civ 1391: This case involved estoppel by convention, where both parties acted upon a shared assumption about the validity of a situation and one party was later prevented from denying the assumption because it would be unjust. By analogy, if the PPC sends an NtH based on an assumption of valid liability transfer, it could be argued they should be estopped from later denying this if it results in unfair treatment of the hire company or hirer.
In Re Vandervell's Trusts (No 2) [1974] Ch 269 the concept of waiver was discussed in this case, where a party's actions indicated a waiver of rights even if no explicit waiver was given. If the PPC proceeds by sending an NtH, a similar argument could be made that they waived strict adherence to PoFA's documentary requirements.
Davies v. Taylor [1974] AC 207: This case concerned reliance on previous conduct to assert rights. If the PPC's conduct implied reliance on the hire company's initial information (by issuing the NtH), the hirer or hire company could argue that the PPC cannot later change their position.
In practical terms, if the PPC sends an NtH despite incomplete compliance by the hire company, they are acting as if the liability has been transferred, potentially waiving their right to later challenge the validity of the transfer due to missing documents. This could be argued in court as a matter of fairness, procedural consistency, and reasonable reliance by both the hire company and hirer on the PPC's actions.
While there is no direct binding precedent for this specific scenario, general legal principles like estoppel, waiver, and implied acceptance, as well as persuasive case law on related matters, support the argument that by sending an NtH, the PPC is effectively acting as if the liability has been transferred, even if the transfer was procedurally incomplete. These principles can be leveraged to argue against the PPC reverting back to the hire company or attempting to enforce liability inconsistently.