404. That’s an error.
The requested URL /bookmarks/mark?op=add&hl=eng&bkmk=http://www.centrica.com/files/reports/2011ar/index.asp?pageid=83&annotation=&labels=&title= was not found on this server. That’s all we know.
/bookmarks/mark?op=add&hl=eng&bkmk=http://www.centrica.com/files/reports/2011ar/index.asp?pageid=83&annotation=&labels=&title=