It should be back up now http://www.igbaffiliatehotels.com/london.php although they are adding Oz and Prague at the moment and changing the server so it may go down again – If not just contact [email protected] or on 0034 93 352 10 10 and they will sort you out.
The main hotel is now full but one that is also 5* and just near the venue is also now available and quite a few people are staying there –
Also I made a map which I will add to as things get announced which should hopefully help a bit LAC MAP – Google Maps