NPA I would agree with but an ILS not so bad.
Yes its preferable to be prepared and all the rest of the good stuff.But when you decide you diverting then find out that some knob has either taken that plate, not put them back where they should or for some reason your having a brain fart because you have not remember that the airport has changed its name eg pennygreen to wolverhampton international spaceport. Its far better to fess up quickly and then ask the ATC to quickly read out the frequency,track,mins and go around instructions. Than have a pilot single crewing it while the other one goes off on a search. If your single crew even more so Aviate first.