Some of the brands I have serviced above or below the line. 
Accenture Interactive (industrial sector, luxury auto)
ANNA Money
Asda 
BBC Worldwide
Channel 5
CNN International Commercial
Crabtree & Evelyn
4 Creative
The Guardian
The Guardian Labs (including Beko, Canadian Tourist Board, Clinique, Columbia Sportswear, Disney, Estee Lauder, Gap, Leffe, Marriott, Pirinase, San Miguel)
Isobar (Kellogg's) 
​Leagas Delaney (Value Retail) 
Liberty London
Market Tech Holdings
Publicis Sapient (Heathrow)
​Redwood London (Barclays, Boots, La Redoute, M&S)
TMW Unlimited (Vodafone) 
Vision Express
​Wonderbra
​Wonderworks Communications