Traces of cocaine can be found on more than 10 per cent of British bank notes, say experts investigating a spike in the use of the illicit drug.
Cocaine use in Britain is now believed to have surpassed levels seen in Australia and the US, The Guardian reported.
An official inquiry carried out by the British Home Office's advisory council for the misuse of drugs found 11 per cent of bank notes in general circulation test positive for traces of cocaine.
The result is a change from four per cent in 2005.
A police spokesman told The Guardian cocaine use is widespread across all British financial and class levels, although research found the typical user was a white male aged 18 to 45 who frequents the night-time pub scene.