You can follow the current proceedings online: here.

There has been a “massive bonfire” (words of counsel) in the National Domestic Extremism Database recently, partly or perhaps mainly because of the HMIC’s assessment that there was massive overinclusion of data.

The existence of this database was revealed by the media (The Guardian, I believe) in 2009. It may have been in existence since 1999 and have widened its scope later.