Originally Posted by
CPMaverick
Besides the cancellation fees mentioned above, for the same miles as the two one-way tickets you could get the LHR-CDG segment for free if you book as a RT. As also stated above, this particular route isn't easy to make on *A, but free is free.
Free is great, but if you value your time, comfort and sanity and you are travelling from the center of London to the center of Paris, the train is a far, far better way to go.