There is only one type of cicada in the United Kingdom, and it is called the New Forest cicada (Cicadetta montana). It is named for the New Forest National Park, where these cicadas can be found in the pasture woodlands. It is both rare and endangered, according to this FAQ, however, according to another website, it might be extinct. It sounds like a small gas motor (in my opinion).
The website ARKive has Five videos of the New Forest cicada, including one featuring cicada larvae still in a tree branch.
Cicadas belonging to the Genus Cicadetta are known as “small grass cicadas”. The New Forest cicada belongs to the same subfamily (Subfamily Cicadettinae) as the Magicicada periodical cicadas that live in the U.S.A.
I have heard the cicarda in the new forest this year my hearing picks it up for some reason. Was camping every evening for a two hours i could here it my partner could not sounded like electric cable buzzing on off i know for sure they are there but dont know who too tell .they saying they might be extinct
Post a sighting on iNaturalist.com. Try the contact info on the bottom of this page https://www.speciesrecoverytrust.org.uk/new-forest-cicada