How old has news of potential hazard to be before you disregard it completely? Is it like politics, for example?
Irrespective of what junk or deliberate structures are buried beneath the concrete, what effects do other clutter have on instruments at this one? Redevelopment around the site has been not inconsiderable for some years now, and the Jet Centre apron seems awfully crowded at times.
I remember three years or so ago seeing a Dornier dropping out of low clag on 10 approach considerably north of the centreline - never did hear the upshot of that incident but it received some comment at the time about the serviceability of the ILS.
Then there was the recent potential clutter formed by the dinged Avro until they moved it to fix it...