Your right - I inferred it from this:
'When an initial decision not to search the landfill was made we remained in contact with the site who had identified where the waste had been deposited.
'They placed nothing further on top of this. Had anything further been deposited we would have encompassed this in the current search.
So they may not have even asked. It implies it was just luck that nothing went in over it. But that only strengthens what I'm saying - the SP statement doesn't rebuff UT's claim - infact it tacitly confirms it. Thanks for pointing that out, seems like I've been giving Plod too much credit.