The two guests rule is for AMS lounges only. However, you are allowed access with one guest at:

All KL-operated lounges
Some KL-contracted lounges
Most NW-operated lounges
MA-operated lounges in BUD
Most KQ-operated lounges

And, I believe, you can get guestless access to Jet Airways lounges.

Outside the KL/NW operated locations, it's inconsistent, however.

So, pretty generous, all told.

A random one is with bmi *Gold. Although you can only access bmi (and other *A) lounges when flying on any *A carrier, you do get free access to 'Workspace' business lounges at motorway service stations throughout the southern UK.