Paid for aisle seat and bought a Center seat in back. One of the additional uncomfortable flights I are on. Not possible to acquire a refund. I had help vacation booked in Denver to Manchester, although not mentioned in HeathRow, my daughter use a spare wheel chair herself for me https://whitemagictravels.co.uk/blog/5-ways-to-book-the-best-holiday-packages-including-flights-to-australia-from-uk/