Sir John has, and still holds a number of top level positions at various companies including: Spacelabs Healthcare Inc, Cycacel Healthcare, Johnson Matthey PLC, AMVESCAP PLC. Merchant Trust PLC, Whitbread PLC, Geest PLC, ECI Partners LLP, Tarmac PLC and Kingfisher PLC, National Power and National Westminster Bank and Labatt Breweries.
Sir John has written numerous publications including The Future of the British Car Industry. He has also co-authored many reports for the CBI on the UK economy, skills and education, transport, the infrastructure, urban regeneration, manufacturing (1987-92) and local government. In addition, Sir John Banham is the author of The Anatomy of Change: Blueprint for a New Era (1994).