1 LIPSEY, R. G., and CHRYSTAL, K. A.: 'Principles of Economics' ( Oxford University Press, Oxford, 1999, 9th edn.)

2 BEGG, D., FISCHER, S., and DORNBUSCH, R.: 'Economics' ( McGraw-Hill, London, 2000, 6th edn.)

3 Speech to the Tory Reform Group, 8th November 1985, reported in The Times, 9th November 1985

4 YULE, I.: 'The public face of a private finance initiative', IEE Engineering Management Journal, 2001, 11, (3), pp. 115 21

5 FLOOD, J. E. (Ed.): 'Telecommunications Networks' ( IEE Books, London, 1998, 2nd edn.)