28 January 2015: We're back! Since we went offline at the weekend the site has been through a complete upgrade of the underlying software. This took slightly longer than we had hoped because the changes between the old and new system were bigger than we had anticipated.
None of the content has changed although one small section has been removed. We'll replace it as soon as we can. In the meantime, we've checked as much as we can but you might spot a few glitches here and there (mainly the way some of the pages appear). We'll sort these as soon as we can.
Sorry for any inconvenience.