Apologies for the formatting problems on the site at the moment. I won’t be able to fix them for a few days. Thanks for your patience.
Update: I’ve managed to patch things up a bit so most of the broken pages should look OK. Many of the “tooltip” info boxes won’t appear over links, and other things might still be broken, but I’ll be able to fix those in a few days. (10.56pm, UK time)
Update 2: The site should be back to normal now. For some reason Movable Type (the software this site runs on) had truncated the template which is used to generate the start of each page. This meant that lots of the crucial code was missing from any newly-created or updated pages. (Monday 11th July)