Thanks balanga, that was why I suggested in annotations in title of watched threads over a year ago. With such a feature, one can look through his annotations to pick out the thread to open rather than opening all in search of a reply or command in only one line of a thread of 50 or more pages .I've just installed a new version of Wordpress (5.2.1) and it comes with a new editor - Gutenberg and this has a whole load of tags including 'code'.
Hopefully I'll find some way of importing some of my posts into Wordpress as it isn't always easy to find them here.