The 2007 Byron report recommended Filtering in all education establishments - and the government ( Labour) accepted these recommendations but did not legislate them - ie make them law, this document from what I see takes it that step further and makes it a statutory requirement to have filtering and Monitoring in schools.
As the report was written in 2007 the big fear was excessive gaming and the negative effective on children and their general well-being - so it was all about filtering, no mention of Monitoring - this is new and part of this gov's Prevent agenda - how times have changed!!
Like Steve of Opendium we too banged our heads against various government depts - DfE, Police, Prevent offices themselves etc., to gain access these mythical Radicalisation terms that have been deemed by 'those that know' to need blocking.
Eventually like others we did it ourselves, though all the effort from the education focused filtering/monitoring industry will only work with parental engagement as once home most of it stops.