I seem to recall an IR initial at a certain gentlemen's flying club in which the CAAFU examiner took the jumpseat as he wasn't type rated. The FO shot an ILS and somehow, he couldn't explain it afterwards, the autopilot was engaged. The Capt in the RHS thought it was all going a bit too well and looked around, noticed the engaged light but thought to best to keep shtum (suspecting quite correctly that the examiner wouldn't know where to look for the engaged light). In the debrief the FO was commended by Capt CAAFU for flying the best ILS he'd seen in years and went home none the wiser.
he he!