Hi all!
Me and a friend are going to travel around in the UK with a InterRail pass for a week in August. The plan is to take the Caledonian Sleeper up to Inverness, and then slowly work our way south during the week.
Now I need some advice. What is the easiest way to reserve a sleeping compartment (without a ticket) for the sleeper in advance? I really don't want to chance it and try to reserve once we get to London, and I also assume it will be a bit cheaper if I reserve in advance?

Me and a friend are going to travel around in the UK with a InterRail pass for a week in August. The plan is to take the Caledonian Sleeper up to Inverness, and then slowly work our way south during the week.
Now I need some advice. What is the easiest way to reserve a sleeping compartment (without a ticket) for the sleeper in advance? I really don't want to chance it and try to reserve once we get to London, and I also assume it will be a bit cheaper if I reserve in advance?
