In reply to Justin Tadlock.

Thanks, and... mea culpa. Your comment makes me realise that I'd turned off some of the standard blocks - including pullquote and spacer. Version 2 / update to come over the weekend then.

Sometimes I think WordPress and Gutenberg are built by people who have never thought to (for example) transform a paragraph into a pullquote, can't understand why anyone would want to do it and then refuse to believe that anyone would ever do so. Until we nudge them gently in the right direction ;-)