Where the Authority would otherwise be expressly liable to make payment to Sub-hubco of sums which include amounts payable in turn by Sub-hubco to any Sub-Contractor, the Authority shall not be entitled to withhold, reduce or avoid any such payment to Sub-hubco in reliance only on the fact that the amount which is due from Sub-hubco to the Sub-Contractor or the entitlement of the Sub-Contractor to payment of such amount as a result of the circumstances giving rise to the Authority's obligation to pay, is conditional on the entitlement of, or receipt of payment by Sub-hubco from the Authority.