In LWMO, our SOPs require us to check the LOC needle is central when lined up. That's a huge clue - the Airbus FBW types actually tune the ILS for you as an aid.
However, this is of course not foolproof. The crew of SQ6 which took off from a taxiway at TPE in about 2000 actually had manually tuned the ILS as per their SOPs because the ir LWMO instructed them to as they had Para Visual Displays (PVDs) fitted to their aircraft. The F/O pointed out that when they were lined up the PVDs were still rotating, the Captain chose to ignore the comment and the rest is history.