Music festivals should provide drug testing facilities to help reduce health issues that are associated with recreational drug use, health experts have said.

The Royal Society for Public Health (RSPH) said testing facilities should be "standard" at festivals so revellers can test the strength and content of drugs they are considering taking.

It said drug safety testing pilots at the Secret Garden Party and Kendall Calling festivals last summer, with the support of local police and public health officials, reduced the amount of potentially harmful substances circulating on site.