Originally Posted by
WineCountryUA
But to restate a point, getting from London to Paris (non-stop) by Star Alliance partner is going to be difficult. You might consider Eurostar train.
I don't think OP specified ns. If they're doing a RT anyways, might as well take the free biz OW on a partner.
OP, you ought to use LON and PAR for those segments. Make sure biz is avail at booking bc (I'm assuming) you won't get it after.