London is home to some of the most innovative and skilled web designers in the world. Here are a few leading web designers and agencies known for their exceptional work:

1. Sagmeister & Walsh: Known for their bold and visually striking designs, Sagmeister & Walsh blend art and functionality in their web projects. Their work is characterized by creativity and a unique visual style that sets them apart.

2. AKQA: A global agency with a strong presence in London, AKQA is renowned for its digital innovation and design excellence. They work with high-profile clients, delivering cutting-edge web designs that combine aesthetics with functionality.

3. Made by Many: This agency focuses on creating user-centered designs that drive business success. Made by Many is celebrated for its strategic approach, ensuring that web design aligns with the client's objectives and user needs.

4. Rufus Leonard: An award-winning agency, Rufus Leonard excels in creating immersive digital experiences. Their designs are known for their elegance and effectiveness, making complex ideas accessible and engaging for users.

5. 93digital: Specializing in WordPress design and development, 93digital is a leader in creating robust and scalable websites. They focus on delivering high-performance websites that are both visually appealing and easy to manage.

6. Beyond: A design and technology agency, Beyond creates websites that are not only beautiful but also highly functional. Their work emphasizes user experience and innovation, helping brands connect more effectively with their audiences.

7. Netizens: This agency is known for its innovative approach to web design, incorporating the latest technologies and trends. Netizens' designs are modern and dynamic, tailored to meet the specific needs of their clients.

8. Foolproof: A UX design agency, Foolproof creates user-centered designs that enhance usability and engagement. Their meticulous approach ensures that every aspect of the website contributes to a seamless user experience.

9. Propeller: Propeller is a full-service digital agency that combines creative design with technical expertise. Their work spans various industries, delivering customized solutions that meet diverse business goals.

10. Unit9: Known for their experimental and interactive designs, Unit9 pushes the boundaries of web design. They integrate cutting-edge technologies to create immersive and memorable digital experiences.

These leading web design agency in London are recognized for their ability to blend creativity, technical skill, and strategic thinking. Their work not only meets but often exceeds client expectations, setting standards in the web design industry.