This is where I think (with the current sets) it would make sense to abolish the Standard/First distinction, and instead just have solo and twin berths which are upgrades from a Standard ticket. So those who have bought expensive first class walk-up tickets don't lose out, they could pay a lower berth fee or receive free catering whatever berth type they chose.
Pricing wise that is essentially what they have already. For inclusive tickets nobody is going to choose the std solo as it is more expensive than the 1st for an inferior product so the class distinction is basically irrelevant, you are either choosing 2 berth or 1 berth.
The only purpose std solo now serves is as a supplement for other std class tickets who cannot choose the 1st class option for a single berth cabin, the std solo supplement itself is more expensive than the 1st class one but obviously including the travel ticket will be a cheaper option so there is still a market for this combination (especially in tourist season with passengers on Rover and Britrail tickets) the only real issue is how those berths are allocated and currently they get a token allocation only.
For 1st class ticket holders there already is a small discount on a single berth as the 1st supplement is less than the std solo, they can also choose a twin berth for less again.
If they changed the std solo supplement to be just a differently priced allocation of any single berth cabin, only available as a supplement at a higher price (as now) for std tickets than the supplement for 1st tickets then it wouldn't alter the product or pricing just give a bigger allocation to that group.
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Friday night to Inverness was one of the busiest I have seen with 107 beds taken. The current set diagram hasn't changed since the takeover which had 6+2 to Inverness for maintenance purposes. As that is not the case now you may see the Inverness portion lose a sleeper coach to Fort William for the summer if the demand is there.
Down services on Fridays and Up on Sundays/Bank Holiday Mondays are always the busiest.
Tonight there is currently just 1 shared berth available from both Inverness and Fort William, everything else is booked out.
Interestingly while solo berths are booked out on Glasgow, Edinburgh and only 2 left from Aberdeen, there is still plenty of space in twin berths available; 40 from Edinburgh, 16 from Aberdeen.
While it appears that they will sell out on the busiest services, outside of those times twin berth cabins are far less popular compared with single berth and in some cases are taking up space that could be sold to people wanting to travel on their own.
In previous years it was the Aberdeen portion that gave up an extra sleeping car for Fort William in the summer peak, as the booking allocations already include 4 sleepers for Aberdeen throughout 2015 the swap could not be done without some difficulty. It does appear that Fort William will be down on capacity from now on.