Hello Raybrettle,welcome to the forum.
That was a mighty expensive bolt......
We've done a few dCi cambelts at work without problems,so far.I'm not aware of anyone else having this problem either,so I think you were just extremely unlucky.
Do you know which bolt broke off,exactly?.
It seems a bit strange that the engine had to come out to repair it.I'm sure access could have gained by another meens?
I'd rather push my Alfa than drive a BMW....
Currently in Lagdti's garage:
2003 Alfa Romeo 156 2.4 JTD Sportwagen (estate to you and me!) and a 1994 Land Rover Discovery 300Tdi with a 2'' lift kit and some girt knobbly tyres on it....