Very little,
The only 2 services I can find are the LNER 1W22 Kings Cross to Stirling at 20:12 and Scotrail 2N70 from Alloa at 23:55
Also 2N73 2351 Glasgow Queen Street to Stirling Mondays to Saturdays, plus an hourly service to/from Edinburgh on Sundays.
I didn't see a mention of Haymarket Plt0, which is only used reversing ECS moves in and out of Haymarket Depot at the moment, although has previously been used to stable sets. Otherwise only required during disruption or amended timetables.
There's also Inverness Plt7 which only has one arrival and one departure per day.
Kyle of Lochalsh Plt2 is in the timetable to be used by one arrival and one departure per day, but might also have the Royal Scotsman. Mallaig is similar.
Huntly Plt2 only has a couple of uses per day, only being used when trains cross there, otherwise services always use Plt1.
Largs, Larkhall, and Wemyss Bay all have more platforms than required, with the second platform only used a handful of times per day.
Cheers,
Ewan