I'm doing a short talk about caving in aid of the Nasio Trust at 1200 on the 8th. My niece works for them and talked me into it. It's free and you can sign up via Eventbrite https://www.eventbrite.co.uk/e/dick-willis-expert-caver-explorer-tickets-146352531361?fbclid=IwAR315nb3UQQ7uevHthnnG0kFLmrhA-6g7S_2kTZZKXrJ4go5Vwl0GTOMa-U
It's intended for a general audience, not directly for cavers but if you having nothing else to do... (it will be recorded and available on their YouTube Channel https://www.youtube.com/results?search_query=nasio+trust)
Sorry about the title, their choice, not mine.