Does Eurocontrol operate differently and is reporting (ATC) 'optional' in a case like this
First as far as I know there is no "Eurocontrol" specific IGS regulation, ATC monitoring/reporting deviations on this , rather each individual State determine his rules, Common sense dictates that any Go around is normally reported on the ATC log. But this was not an ATC incident.
Remember also this was not an ILS but and IGS . You have a visual part in the end., and it is the pilot who is responsible for terrain clearance, not ATC.
On the Av Herald page there is a very interesting comment :
The IGS is not used by the DH8 due to systemic limitations with regards to maximum glideslope angle. The only approaches approved and used are the two LOC approaches leading to a circling into 19 and a visual approach into 01. No other approaches are executed.
This sounds to come from someone who knows what he is talking about, but ok this is Internet...
If true, then they were on a visual leg, and the incident is an interesting one..and explains why the SUST is looking into it seriously.