The website is back working after the security warning, just in time for final practising! The people whose server holds all the data needed to issue a new security certificate as the previous one expired on 2 December. The certificate tells the Internet browsers that the website is safe to use.
Just so you’re aware, we get this hosting service free of charge as the server is a private one owned by a friend who has a big online business. I keep expressing my thanks because it’s saving us quite a lot of expense.