The UK is not doing enough to track wasp populations as numbers appear to plummet, a leading expert has warned.

While there were national monitoring schemes for some invertebrates, including bees and butterflies, there was no such programme in place for wasps, said Dr Gavin Broad, principal curator of wasps at the Natural History Museum.

This year, wasps appear to have faced a sharp decline, with the colder and wetter weather believed to have dampened their numbers, as reported by gardeners, experts and pest controllers.