Not quite right yet about IAPs on charts. The current practise is for IAPs to be marked on the main runway only; where there are IAPs on both ends of the main, they will be marked on both ends when in Class G.
If there is only an IAP on one end (ie: EGKB) it is only marked on the one end.
If IAPs to subsidiary runways, these are not marked (for chart clarity).
Also not marked on charts are:
1) Instrument Holding patterns for the airport if in the overhead or what could be considered a 'normal' IAP area associated with the airport
2) Instrument Departure routes
3) Instrument Missed Approach Procedures
4) Visual Manoeuvring (Circling) areas
As someone else mentioned, ATC often authorise IAPs to a runway that might be against the expectation predicated by the wind conditions (for expedition, or training - particularly where a particular type of IAP is available to only one runway end.
All of the above are good reasons for putting in a call to ATC when in the vicinity; if you can't, then they could be good reasons for giving a wide berth.
Also note that quite a lot of flights may not be conforming to the ideal vertical profile of an IAP, especially if being radar vectored. Don't assume anything!