Supreme Court issues landmark ruling on undue influence in hybrid loan

The Supreme Court’s Decision

The Supreme Court unanimously overturned the decisions of the lower courts. In a judgment delivered by Lady Simler, the Court clarified that lenders are put on inquiry in any non-commercial hybrid transaction where a more than trivial portion of the loan is used to discharge the debts of one borrower, thereby creating a potential financial disadvantage for the other borrower.

Lady Simler rejected the “fact and degree” approach adopted by the Court of Appeal, stating that the correct approach is a bright line test. The key consideration is not how the loan is actually used, but rather what is apparent on the face of the transaction—namely, whether one party is incurring a liability for which they derive no obvious benefit.

If such a surety element is present, lenders are required to follow the Etridge protocol, which includes ensuring the vulnerable party receives independent legal advice to confirm their understanding and willingness to proceed.

Key takeaways

• The Court reaffirmed the principle that lenders are under a duty of inquiry when a borrower may be acting as a surety—regardless of whether the loan appears to be a joint borrowing.
• The presence of even a modest surety element—here, £39,500 used solely to discharge Mr Bishop’s personal debts—was enough to trigger that duty.
• The test is objective and based solely on what is visible from the face of the transaction, not on the lender’s assumptions about its purpose.
• A binary framework applies: a lender is either put on inquiry and must follow the Etridge protocol, or not. There is no sliding scale of duties based on the degree of risk.

Implications for Lenders

This decision represents a critical turning point in the duties of care imposed on lenders, especially in consumer-facing mortgage and remortgage transactions involving couples or family members.

The Court has made clear that lenders can no longer avoid scrutiny simply because a loan is styled as a joint borrowing. Where any part of the loan repays the sole debts of one party—no matter how minor—lenders must treat the transaction as involving a surety. As a result, they will be put on inquiry and must follow the full Etridge protocol, including ensuring the non-benefitting party receives appropriate independent legal advice.

Conclusion

The judgment in Waller-Edwards v One Savings Bank carries weighty consequences for banks and mortgage providers. Just as Etridge reshaped the landscape of secured lending in 2001, this latest ruling demands a recalibration of lender practices.

Lenders should now conduct deeper scrutiny of loan purposes, even in jointly executed transactions. Existing practices of relying on borrower declarations or assuming mutual benefit from joint applications will no longer suffice. Failure to adapt could expose lenders to claims where transactions are later challenged as having been procured through undue influence.

In short, this judgment is a clarion call to lenders: where hybrid lending transactions are concerned, vigilance is no longer optional—it is a legal necessity.