I thought some of you might be interested in this project:
http://blog.ordnancesurvey.co.uk/2013/04/launching-a-new-linked-data-service/

The database:
http://beta.data.ordnancesurvey.co.uk/datasets/os-linked-data

one of the examples:
http://beta.data.ordnancesurvey.co.uk/doc/7000000000038413