The thing is there are voids within the hill that are moving upwards at an alarming rate. If a void reached the surface and someone falls in then the only way to get them out will to destroy one side of the hill.
;(
Is it worth the risk?
Also, IHMO if the ancient builders wanted people to walk to the top they they would have built a pathway.
Standing on Waden hill and looking down onto Silbury is stunning (eh Lissy?)
ALSO I am now in the habit of stopping my car when I see people on the hill and yelling abuse at them. If they ignore me I jump up and down on the roof of their car untill they come running down again :)
PeteG