ooh I'm having a little vision of the future...
.. 'The Silbury Experience' interactive multimedia centre at the base of the hill (entrance £5.50) including holograms of King Sil himself and druids galore
... Miniature silbury paperweights in silver plate for sale in the shop on top of the hill
... Cable cars travelling up and down the slope
If EH did this they could pay for the repairs in no time.