About 12boxes Ltd

We are a specialist coaching and training company working with management and specialist consultancies who want to grow by enabling more consultants to hold profitable business development conversations with clients.

We offer distance coaching and online training to individuals and groups globally with our hybrid programme, ‘Client Engagement Mastery’. We also offer bespoke training courses and workshops throughout the UK and the EU single market.

We contribute to our client’s profitability by increasing the effectiveness of their business development conversations with clients, eliminating wasted time and effort on unsuccessful proposals, and shortening the time from initial conversation to order.

Our programmes are based on over 40 years’ experience of delivering training programmes and online coaching to management and specialist consultants ranging from sole practitioners to the largest global firms.


Malcolm Sleath

Malcolm Sleath is the inventor and developer of the 12boxes system. He has been working with consultants, advisers and technology specialists for over forty years. Based in London UK, Malcolm holds UK and Irish passports.

Sectors and clients

Current and previous clients include specialists in: accountancy, actuarial, banking, education, electrical and mechanical engineering, electronics, film and television production, food manufacture, hospitality, human resources and training, information systems and technology, instrument design, intellectual property, law, management and industrial consultancy, physics, printing, product design, telecommunications.

Partial list of current and previous clients: Accenture, American Express Bank, Bank of New York, BDO Binder Hamlyn, British Telecommunications plc, Cambridge Consultants, Diverse Limited, Electrical Contractors’ Association, Environment Agency, Ingersoll Engineers, IPC Magazines, National Physical Laboratory, NNC, Oxford Instruments, PKF, Price Waterhouse Coopers, Royal Bank of Scotland, Salford University, South West Water, VG Instrument Group.