BAA's new owners Ferrovial, being essentially a construction company rather than a group of investors (they also own Amey, a major UK construction organisation), know rather more about condition of assets than the red braces brigade from Threadneedle Street might have done (or the jumped-up shopkeepers who previously inhabited BAA's upper echelons). They will thus doubtless have put a bit of contingency budget to one side to sort out any assets whose condition was hidden from them during the "Due Diligence" process of checking out a potential acquisition.
Things like this collapse will hopefully lead to some interesting investigations by the new owners, particularly if the Health & Safety Executive cause Senor Ferrovial himself to have to come over from Spain to answer their enquiry.
By the way, I notice the BAA
PR department have worked overtime to keep this one out of the media. There's not a peep anywhere.