National Westminster Bank Ltd v Halesowen - Case Note
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National Westminster Bank Ltd v Halesowen Presswork & Assemblies Ltd  AC (Let me Google that for you) is a decision of the House of Lords in relation to a banker's right to combine accounts under English law. It is the leading English case and a banker's right to combine accounts, and also an important decision relating to insolvency set-off.
The case concerned the Bankruptcy Act 1914 which has since been replaced by the Insolvency Act 1986, but the decision is still treated as authoritative.
The majority view that the insolvency set-off provisions were mandatory and that a party could not waive them or contract out of them is regarded as the settled law. This position has now been affirmed by the subsequent (unanimous) House of Lords decisions in Stein v Blake  AC 243 (Let me Google that for you) and Re Bank of Credit and Commerce International SA (No 8)  AC 214 (Let me Google that for you)