Be honest. . . . ish!!!!
Are you going to "Q" at the economy check-in???? Not go in the club lounge?? why not just get a seat in economy!!!!! I would phrase it how you have.....
" I see we are on the same flight back to London, it was possible to get a better seat by using the airmiles that I have had for ages. Never had a use for them before...blah blah blah......"
Or if they are blingy friends that like showing off, don't say a word, check-in at the club desk, and look all surprised as they join the economy "Q" and say " sorry, I assumed we were all in the big seats"!!!!
