I need to go one way from Disneyland to London this summer. The prices are out of this world. I've been thinking of booking 2 adults and 2 kids on the TGV from Disneyland to Lille. I was then going to book one-way trips from Lille to London for the kids and same day return for me and my wife and then throw away the return. Can you get it trouble for this? Will I be questioned about not getting returns for the kids? It would save me about $350. Any help would be appreciated.