There appears to be no reported case where, in this sort of scenario, the borrower has succeeded in suing the bank (for examples of failed attempts to do so, see eg Deutsche Bank (Suisse) SA v Khan and Commercial First Business Ltd v Atkins). The posited scenario also contains quite a number of variables: • what kind of borrower? • what kind of lending? • what kind of security? • how was the enforcement challenged (and with what degree of success?)? • what sort of opportunity was lost, and how? This Q&A assumes that the borrower can successfully demonstrate that enforcement of the security was somehow improper and that it caused a loss of opportunity to make money from the asset over which security was held. That could, in principle, give rise to a claim against the lender/bank, on one of the following bases: Breach of contract If