If you’re still following this, some more info that might be helpful?
The train companies do indeed play a game with ticket prices. From here I can get to Mallaig and back on 2 singles for £52 in April, but to Fort William is £80. Recent news stories suggest that they do check where you get on and off too. Different days also have different prices.
Mowgli – interesting – I’ll look into booking several legs separately.
Last year when I got to Glasgow, Scotrail were insisting on bike reservations for all trains. When I’d bought the tickets the travel centre assured me I didn’t need them (I’m assuming a rule change). So do insist on getting bike reservations for all trains in Scotland when you book. You can’t make them within 2 hours (I was told) of departure. I had to bluff but got away with it…
You can’t book bike res online (or can you now?). I look online & work out the best options for trains, then go to the travel centre in Worcester to book them together with the bike res. The folks at Worcester are very good at it.
Now I just have to wait until the May timetables are released, see what I can get. Touring the west coast of Scotland is fantastic and well worth all the train hassle.