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Bike carriages on Avanti are normally at the end (generally at the far end, coach A). As above, I don't know any way of finding out in advance which platform the train will be (although I guess you could go old fashioned and just ask someone) but it's normally up 10-15 minutes in advance.
You then need to try and find someone to actually open it if it isn't already open. Also worth reminding the train manager that you have a bike on and will be getting off at Preston.
At Preston you then jump off and attempt to find some bugger to open the bike carriage door so your bike doesn't carry on to Glasgow. You may have to stick your foot in the door to stop the train setting off if worst comes to worst.
For Preston to Blackburn there's no booking. There is a bike carriage with a bit of extra space but unless the train is packed then you're probably OK in any vestibule as it is only one stop (assuming you are on the fast train).
I've booked a train ride to Blackburn and back which is very exciting. I also made a reservation for my bike both ways. What is the procedure that one has to go through at Euston when boarding?