MIG wrote:

Someone did point out that the revenue would be divided differently,
and FGW wouldn't get any of it, which was why they would have
objected.

Looked at that way, it's not much different, logically, from paying in
advance for a Ryanair flight and trying to use your booking on a train
to Southall because it's the same price. Or handing over your money
in one shop and taking goods out of another on the grounds that the
price was the same.

It's very different. It's more like if you handed over your money in one
shop so you could collect at another location, and then when you got to
the location they said you had never paid for the goods. (Not so
far-fetched--for example it is possible to pay at the John Lewis in
Cambridge and then pick up your items at a remote collection spot
several miles away.)
--
Michael Hoffman