As of my last knowledge update in January 2022, there isn't a specific theory universally recognized as the "london theory" within a scholarly or academic context. However, it's possible that the term refers to a theory or concept that emerged or gained relevance after that time.

Given the absence of a widely acknowledged theory specifically labeled as the "London theory," I can discuss London's significance in various contexts and theories that have been associated with the city historically and culturally.

### London as a Cultural Nexus

London, as the capital of England and the United Kingdom, has a rich historical and cultural legacy. It has been a melting pot of diverse cultures, ideas, and movements for centuries. Its significance in the fields of literature, politics, arts, and economics has often served as an inspiration or backdrop for numerous theories and discussions.

### Economic Theories and London

In economic theory, London's role as a financial center has been a subject of study. The city's financial district, known as the City of London or simply "The City," is a hub for global finance, leading to discussions on theories related to global financial markets, international trade, and economic globalization. The "London School of Economics and Political Science" (LSE) is an esteemed institution known for its contributions to economic theories and policy discussions.

### Urban Studies and London's Development

London's growth and urban development have been a focal point in urban studies and sociology. The city's expansion, social dynamics, and urban planning have been studied extensively. Various urban theories, including discussions on gentrification, urban segregation, and the impact of multiculturalism, might be associated with the development and changing landscape of London.

### Historical Theories and London's Influence

London's historical significance as a center of the British Empire and its impact on world history may also be linked to various historical theories. Discussions about imperialism, colonialism, and their effects on global power dynamics often draw references to London as a central node in these historical processes.

### Cultural Theories and London's Artistic Scene

The city's vibrant arts scene, encompassing theater, literature, music, and visual arts, has often been an inspiration for cultural theories. The influence of the Bloomsbury Group, the emergence of various artistic movements, and London's status as a cultural melting pot have contributed to discussions surrounding cultural theories and the evolution of societal norms and values.

In conclusion, while there might not be a single, well-known "london theory," the city's multifaceted nature has contributed significantly to various academic disciplines and theoretical discussions. Its historical, economic, social, and cultural dimensions have often served as fertile ground for the development and exploration of numerous theories across diverse fields. Any specific theory associated with London might refer to a niche or specialized area of study that has emerged more recently or within a specific academic discipline after my last update.