OK .. thanks ... very disappointing on so many levels.. I would be happy to fly via ORD but just nothing available. I think my best bet is to give up on the pre-devaluation trip and let both bookings go and hope the seats go back in the pot and try and rebook the YVR / DEN return with the soon to expire voucher...

or

Swallow the fact I've thrown away both a 2 4 1 and the benefit of the pre-apr 28th booking.

Neither very appealing and very little time to decide without losing a further £70 ...