tomwatts wrote: I'd prefer it if they just packed it solid with pure chalk, and then left it alone.
Leaving it alone looks unlikely. Skanska (and English Heritage) will want to know that their work at Silbury has been successful - hence the need for the geo-electrical cable. Archaeologists will want to know that they can gain access to the heart of Silbury at some future date via Rovver-type probes (hence the size of the newly-cut trench). What is unacceptable (from a conservation point of view) is that the new trench, involving the removal of x cubic metres of untouched Neolithic building material, has been cut into the structure without public consultation or public approval.
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