I think I have found the answer to my dustbin renaming issue. I have just deleted a test file, and now have a New dustbin folder named [Recycle Bin] which has just appeared, this was the name that I chose for it.
My original "_dustbin" folder was still there complete with its contents so I decided to move these deleted files to my [Recycle Bin] by selecting all and then moving them. This caused the box to reboot, but when I tried it again it worked. I then deleted my empty "_dustbin" folder, and tried deleting another recording which seems to have gone completely so I seem to have broken undelete by removing the _dustbin folder.
My original "_dustbin" folder was still there complete with its contents so I decided to move these deleted files to my [Recycle Bin] by selecting all and then moving them. This caused the box to reboot, but when I tried it again it worked. I then deleted my empty "_dustbin" folder, and tried deleting another recording which seems to have gone completely so I seem to have broken undelete by removing the _dustbin folder.