As of yesterday (3rd October) there was an issue with the server where the HGG site is hosted, resulted in both the site and the forums being unavailable.
Today, it appears that the site is back again but there is still an issue with the forum (IPS errors on the database).
I have tried repairing the Database but this has not resolved the issue. Please bear with me while we wait for the hosts to resolve this. I will post here once everything is back.