OS,
Is [1] one of the datasets listed at http://datahub.io/dataset?q=ordnance+survey ?
Although the site is being announced today, I don't see any recent changes to the listings at
http://datahub.io/dataset/history/ordnance-survey-linked-data which appears to listing for your site.
If this is your listing, could you update it?
Thanks,
Tim Lebo
[1] http://blog.ordnancesurvey.co.uk/2013/06/new-linked-data-service-launches/
linkeddatawebsite@ordnancesurvey.co.uk