Exactly the same problem for me - travelling down to Cornwall for my hols on the M5. All seemed fine but suddenly lost power and could not make more than 60mph (and 40mph up hills)! I took a look at the engine but could not see anything so we pressed on - just got home and a quick search of this forum, I found this thread - I checked the turbo and there was this little tube just dangling there! So I have stuck it back on to the turbo and will give it a drive tomorrow - fingers crossed.
But thanks to this forum I hope I have cracked it - cheers
