He will advise the ethical and lifestyle specialist's clients on sustainability and CR.
Clients include Ban Bullying at work, Percol Coffee, Fairhills, the world's largest Fairtrade wine producer, London Aware and Green Cuisine.
'Last year, more was spent on ethical goods and services by UK consumers than on alcohol and tobacco, at over £28bn' said Broadbent. 'The sustainability agenda…is not going to go away and any PR company that knows its stuff will thrive.'
Broadbent remains on the boards of travel specialist Brighter Group and of Argyll Consultancies, the parent Kaizo.