I did search for EXTRA in case someone had posted it before. However, the search function is super crap. It has a random list of stuff in no particular order I can work out. No way of filtering the search results or sorting them in any way. Are there any plugins for SMF to give us better searches?
The quick search box is a bit basic.
Go to the Search (http://forum.orpington-astronomy.org.uk/index.php?action=search) option in the main menu and take the Advanced Search (http://forum.orpington-astronomy.org.uk/index.php?action=search;advanced) link from there.