Willem, you're a sweetheart! Always nice to read your comments, thank you.
Neil, thanks for taking the time to look at the video, and for the encouragement.
I've started practicing the C Dim and wondered if I should be leaving both the middle and ring fingers on their strings coming from the E, or only one guide finger, or none at all. It might just be a case of whatever feels right, but I'm always keen to follow best practice when it comes to picking fingers etc.