Who are the top five design companies within the UK?

According to a blog post by "Design Intellect" the top 5 'award winning' design agencies are;

1. 1HQ
2. Wolff Olins
3. Why not associates
4. Williams Murray Hamm
5. Venture Three

Design Intellect 

However, here are the top 5 'award winning' advertising marketing agencies;

1. Wieden & Kennedy
2. We Are Social
3. Vallance Carruthers Coleman Priest
4. Universal McCann
5. Tullo Marshall Warren

 Design Intellect

These results may be inaccurate however due to the blog posts being for the "top 50" for their category, however the bottom 5 are agencies which have worked for many well-known companies therefore I presume they are some of the top companies out there.  For example, "1HQ" has worked for: Coca Cola, Cadbury, Nestle, Marks & Spencer, Tesco and more. Wieden and Kennedy has worked for: Nokia, Nike, Honda, The Guardian, The Kaiser Chiefs and more. Given the businesses that they have worked with, even though the blog posts are somewhat inaccurate in the order of "top 50" I feel that these companies are somewhere near the top 5 design companies. I feel that the website is reliable as the creator of it has 15 years freelance experience within website and graphic design, meaning he has done a lot of research prior to the posts; it's what a freelance graphic designer does, so that they can know what's happening in the industry and keep up to date.