Just had the same problem on my 2001 Fiesta, a tinny sounding rattle from behind the dash when driving at 30 and above. I have just fixed it and its not behind the dash. Got to get underneath and check the heat shield above the exhaust. I found that the two steel fasteners holding the heat shield at the front end had caused corrosion to the alloy. Consequently the fasteners are ineffective, there is no support and when accelerating above 30mph it starts vibrating causing the rattle. Easy fix, back off the fasteners (did this with a socket), re-shape the heat shield so that it will sit underneath the fasteners, screw them back down tight trapping the shield. Sorted.
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