On Wed, 16 Nov 2005 23:12:52 GMT, Lobster
wrote:

I think they said
the floor slab cost a whopping £15K MORE than the equivalent in
conventional concrete.

It was £15k over estimate, don't know the basis of the estimate. (I'm
not surprised they got upset though, if they'd been telling the
architect that the budget was crucial and then the first major job was
£15k over estimate.)