Is the engine at TDC in that pic?
I don't know, I was just out working on the wiring in the car and thought about the tiing belt.Is the engine at TDC in that pic?
none, belt looks fine to me.Any sign of anything being ingested?
+1 to all of that, especially the cause - it wouldn't take a large stone to make the belt jump. Would just need to drop down to the crank pulley and the power of the engine would drag it through and teeth would be jumped. Nothing stopping it from being dragged through again and again. Look for scratches on the crank pulley.Fixing is easy, pull the timing belt, line everything up then re-fit. it'll be easy as you don't have any of the covers to remove, I could do it in 30 mins if you were a bit closer.
I'm with Gixer on the cause though, stone in the workings causing everything to jump. Exposed camgears are FTL IMO
EDIT cops of your EDITA Comp test will tell you feck all, your valves won't be closed/open at the right time. The timing/misaligned cams are definately the cause.