Some of the brands and agencies I have serviced. 
Accenture Interactive (industrial sector, luxury auto)
AKQA (luxury auto)
ANNA Money
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)
Havas London 
Heathrow
​Leagas Delaney
Liberty London
Market Tech Holdings
Publicis Sapient
​Redwood London (Barclays, Boots, La Redoute, M&S)
TMW Unlimited
Vision Express
Vodafone
​Wonderbra
​