"This mechanical filling process is a very time consuming and labour intensive process, using many thousands of bags filled with chalk..."
You know, after several readings of this update the more incensed I become at its total ineptness and lack of clarity (not to mention its appalling standard of English). For god's sake English Heritage, if this kind of Mickey Mouse reporting is a reflection of your conservation work at Silbury then heaven help the future of that structure under your guardianship. 