Independent estimates imply that the cost of fraud is likely to fall between £3.73 to £5.74 billion per year. The Department of Health disagrees, but investigations are underway.
The financial cost of healthcare fraud 2015: What data from around the world shows. [Online]: Forensic and Counter Fraud Services at PKF Littlejohn / Centre for Counter Fraud Studies, September 2015.
This relates to:
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Gee, J. [and] Button, M. (2015). The financial cost of healthcare fraud 2015. What data from around the world shows. London: PKF Littlejohn / Centre for Counter Fraud Studies at University of Portsmouth, September 24th 2015.
Triggle, N. (2015). Fraud could be costing NHS in England £5.7bn a year, says report. London: BBC Health News, September 24th 2015.
November 2017 Update
This much reduced estimate may be incorrect, as fraud is by definition largely undetected.
Triggle, N. (2017). ‘Despicable’ fraud costs NHS in England £1bn a year. London: BBC Health News, November 1st 2017.