What's New - a log of updates, new material and fresh stuff

There has been a need to register new additions and updates to this website. Some folk have mentioned that they were unaware of new features and fresh data being added to old pages.  What follows is a practice adopted in engineering - what we used to call a 'change log'.  It broadly starts from the end of 2023. Where a page has been updated many times, only the most recent will be recorded. This is not an act of precision, but an indicator to frequent visitors that an update has occurred.  Magenta coloured text indicates a new page rather than an amended existing page.                                                                                                                                                              Tony Nicholls