‘“No Oral Modification” clauses (“NOMs”) are regularly found in the boilerplate clauses towards the back of contracts. They are designed, and included, to try to impose some formality on future changes to the contractual arrangement between the parties. But does this work, and, if so, how? The conceptual difficulty with such clauses has been around for centuries.’
Wilberforce Chambers, 5th December 2019
Source: www.wilberforce.co.uk