In 1996 he was appointed CEO and Chairman of the Executive Committee of British Telecommunications plc, where he served until early 2002. Promising a "rollercoaster ride", during Bonfield's tenure the share price went from £4 to £15, and back again to £5. Bonfield's salary to 31 March 2001, was a basic of £780,000 (increasing to £820,000) plus a £481,000 bonus and £50,000 of other benefits including pension. He also received a deferred bonus, payable in shares in three years' time, of £481,000, and additional bonuses of £3.3 million.