Every leader has a responsibility to set the right tone at the top, to live the values the company espouses, and to really lead by example - just repeating the rhetoric is not enough.

A staunch advocate of responsible business, Sir Michael Rake, the chairman of BT Group, offers insights into creating a company culture that wards off unethical practises.

Sir Rake began his career at KPMG (Peat Marwick) in 1972, working in Europe, where he ran the audit practise in Belgium and Luxembourg from 1984 to 1986. He then moved to the Middle East to run the practise for three years.

After transferring to London in 1989 he became a member of the UK board two years later and had a variety of leadership roles before being elected UK senior partner in 1998, then international chairman in 2002.

He moved on to become chairman of KPMG in Europe and then chairman of KPMG International and senior partner of KPMG in the UK. During his tenure he oversaw the campaign to ensure there has been a progressive and pragmatic legislative response post-Enron.

In September 2007, Sir Rake was named chairman of BT Group (British Telecom), one of the world's largest communications companies. He is also a director of The McGraw-Hill Companies, and the chair of the UK Commission for Employment and Skills.

This video is supplied courtesy of Fifty Lessons. To find out more about Fifty Lessons click here