Marmotte 2010

Slight complication with virgin trains: "Bike Reservations - We have special bike storage areas on-board our trains with space for up to 4 bikes or 2 tandems. Due to limited space you will need to book a reservation for your bike before you travel. The service is free and can be made at any booking office or by calling 08457 222 333. We regret that it is currently not possible to make bike reservations online."

Yeah this normally works fine. Just make platform staff aware of your booking and they sort you out. They have a lot of space in their designated storage areas.