I booked two tickets from London Kings Cross to Leeds with return. I
had to use a separate credit card for each ticket because my company
wouldn't like paying for my wife's ticket while i'm on business .

Anyway, since I booked them separately, they wouldn't seat us
together. How difficult will it be come trip time to get two seats
together? Are there usually open seats, are people willing to move a
bit, how flexible is it?

Thanks