I have blogged a couple of times on using GI within the schools sylabus. I inteneded to regularly update the Educational Links section in the side panel here but haven’t got round to it for ages. So many thanks to Mark Smith of the Grammar School at Leeds for his mail.
As for good educational links, their scarcity is part of the problem teachers face in implementing school based GIS, especially when it comes to sourcing data.
You might have a look at the main teacher support sites at
https://www.rgs.org/OurWork/Schools/Resources/GIS/Geographical+Information+Science.htm
https://www.geography.org.uk/projects/spatiallyspeaking
https://www.ordnancesurvey.co.uk/oswebsite/gisfiles/
and a good school GIS site is
https://www.ke5ways.bham.sch.uk/kegs/cpd/gis_index.htm
There is some material at https://www.geographyteachingtoday.org.uk/fieldwork/info/teaching-technology/
and Noel Jenkins’ site at https://www.geographypages.co.uk/gis.htm is worth a look