Didn't happen overnight per Hooberman.

...I instigated the project in 2004, then a research project, to get the BBC into the blogosphere.  We got our framework together in 2005, started the trial in 2006 and have just come to the end of an 18 month trial... 

Looks like only blogs written by BBC staffers are included in the available customized feeds. In time, expect the BBC to include blog feeds from non BBC employees.

There's just too much good blog content written by citizen journalists for the BBC to ignore the value delivered to their readers. The BBC would act as an editor by selecting which blogs and which posts to offer just as the New York Times does with 'Technology Headlines From Around the Web' on its Technology Section.