The recent UK Supreme Court’s decision in Rock Advertising Limited v MWB Business Exchange Centres Limited was highly anticipated. Modern litigation rarely raises new fundamental issues in the law of contract; this case, however, dealt with two. The first issue was whether a contractual term providing that an agreement can only be modified in writing and must be signed by both parties was effective. Such terms are commonly referred to as “No Oral Modification” clauses. The second issue was whether an agreement to vary a payment obligation was supported by consideration.