BGfL - BGfL Home - Mathematics Learning Resources The Birmingham Grid for Learning publishes fine-grain resources roughly corresponding to an NRICH problem or interactivity. Access is through this single page bristling with links - not the most user friendly approach. This is a rather idiosyncratic collection which does include some pointers to other larger collections - but there seems to be some locality policy that favours things like the Birmingham Weather Station over NRICH or Swarthmore.