MrMickS
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I was thinking the same thing. If a cam lock tool wasnt used or a make shift cam lock tool has slipped then a single valve and piston could meet easy enough.
The valve head falling off suggests a shock or stress fracture occurring you will probably never know why. Even if cam belt fitting error caused the piston and valve contact because its wasnt an instant failure it would be impossible to prove.
There's not a lot that can be done to prove things either way. Given the cars that they get in, and that they have a good reputation on Alfa Owners, leads me to believe that its a failure pure and simple. Probably related to previous work on the engine where a single cylinder was replaced.
Looks like I'll be able to have it back either tomorrow, or early next week, so that gives us a few weeks use before heading off to Italy in the Maserati. Will probably lay it up for a month and SORN it etc for that. Then think about storing for the winter depending on how the weather looks. Of course if there is another Llandow track day in October that would change the plans