In the 1970s Andrew specialised in project appraisal and cost benefit analysis relating to developing countries. In 2008 he revived this interest with an article which analyses the assumptions made when deciding whether to use the Private Finance Initiative to pay for infrastructure investment in Britain: ‘Value for Money in PFI Proposals: A Commentary on the UK Treasury Guidelines for Public Sector Comparators’, Public Administration, Vol.86, No.2.

His interests in PFI continue – both in emerging countries (he has supervised students working on PFI in Taiwan, China, and India), and in the UK, especially in local government.