The UK data indicates a buyout rate of 2.3% based on the total cost of the buyout projects as a percentage of the total cost of all PFI/PPP projects.
The rate for UK terminated contracts is 4.5% and for contracts with major problems a rate of 9.9% on the same basis.
This gives a combined UK total of buyout and terminated contracts of 6.8% compared to the World Bank ratio of cancelled (terminated) contracts of 5.4% - in other words, the UK's ratio, an industrialised country, is higher than the average for developing countries!
Furthermore, a combined buyout, termination and major problem ratio, excluding the projects being bailed out, rises to 17.7%.