The last report? bruised and battered and looking slightly the worse for wear Silbury is repaired.....
http://www.english-heritage.org.uk/upload/pdf/Silbury_Hill_web_update_32.pdf

Coincidentally reading a plant flora last night; when EH come to scatter some seeds around to cover those bald patches they should add some Squinancywort (Asperula cynanchica)....
In 1574 a Flemish botanist climbed this 'acclivem cretaceam et arridam montem arte militari aggestum' (steep chalky dry hill raised by military art), he climbed Silbury Hill and found a plant blossoming in July which seemed to have been the above plant, though he called it Anglica Saxifraga - the first record for Britain.... expect Rhiannon would be interested by that non news ;)