Collins, now a columnist and lead writer at The Times, is joined by Tim Johns, the former vice-president of global corporate comms at Unilever and John Longworth, the former head of corporate affairs at Asda.
Simon Matthews, chief executive of Fishburn Hedges, said: ‘Each has deep experiences in key areas of the communications landscape in which we work, and will greatly enhance the service we can provide for our clients.’
The three will join existing adviser Professor Alan Knight in providing senior counsel to Fishburn Hedges and its clients.
Collins, a former speechwriter to Tony Blair, has also worked as a comms consultant for a variety of leading UK firms and was director of the Social Market Foundation.
Johns spent nearly six years at Unilever and had previously held senior roles at BT, Homebase and Sainsbury's.
Longworth is a non-executive director of the Co-operative Group, a member of the Competition Commission Panel and a non-executive director of Nichols plc. He has also worked as a director of Tesco.