Kendal Calling, the annual music festival near Penrith, has grown into a major event, which attracts thousands of people to Cumbria, bringing both an economic boost and allowing local people to see some of the world's best bands.

But this year's festival has been blighted by the death of an 18-year-old and the hospitalisation of eight other people following suspected drug abuse.

Festival-goers themselves have taken to social media to complain about the prevalence of drugs at the festival and about how it spoiled their experience of the event.

Meanwhile leading public health expert Professor John Ashton has called for an urgent review by all those concerned with organising and providing security to see if there are any lessons to be learned.

Most people would accept that drugs are always likely to be present at music festivals and, whatever the level of security, some drugs will be sold and taken at events where thousands of young people gather to listen to music.

There were security measures in place at Kendal Calling, whose own website states that the festival operates a zero-tolerance policy to drugs. And, after the death of the Millom teenager, messages were placed on the main screens and announcements made from the stage about the dangers of drugs.

But, so far, there has been no announcement from Kendal Calling organisers, Cumbria Police or Eden District Council, which issues a licence to allow the festival to take place, that an urgent review of security and safety measures will take place. The police say they will debrief and take learning to future safety advisory groups, while the council says it reviews procedures every year as a matter of course.

It might well be that the death and hospitalisations could not have been reasonably prevented. But Prof Ashton is right to call for the swift enactment of the equivalent of a serious case review.

Surely it makes sense for all the authorities concerned - plus other experts if necessary - to get together as soon as possible to review security and safety procedures to try to ensure that such tragedies do not re-occur in future.