Thanks for the thorough reply. If we do get a return ticket it's GBP 14 versus GBP 18 doing both legs individually on the bus. Still not a great amount of difference.
We really can;t take the later flight as we then fly out of LHR to LAX, so we'll just pass the extra time in the Concorde Room as this one's in F
We'll avail ourselves of the breakfast at the hotel on the two prior morning, though.
Even if I buy two and I can't activate both, the app does have a transfer option, so I can make sure that she has it as well, just in case.
Cheers,