Originally Posted by KARFA

I can help on this. If you want to book say LHR-JFK-LHR in club, and you have a 2-4-1 + GUF2, then you just need I class in club. No need to worry about reward availability in WTP or CW. You would pay the avios rate for WTP for one person, and the taxes/fees/charges for 2 people in club.

Once you throw in the GUF then you can take advantage of the relatively new provisions which allow booking of GUFs based on revenue selling classes, reward availability isn't needed.