Noticed the E400MMCs Dunfermline have are hardly ever on the 19 after them saying the service would be converted to newer double deckers, the odd one or 2 is on it but it's mostly the Scania E400s on the service and even still the odd single decker
Outside of Express Services and Airport services, and those restricted by low bridges, stagecoach doesn't really tend to use the specified vehicle type on any particular service, but what is availiable at the start of the day.
So MMCs might be in for inspections, MOTs, or repairs, and a Scania will be allocated in their place, or an MMC might have been found defective in the morning, so whatever was ready went out in its place and whatever that bus that went out on the 19 was supposed to be doing, the MMC will now be doing if the fault is an easy fix.
Also if a B8 isn't availiable for express work, they have to then put on a Euro 6 vehicle, and usually they will put an MMC on over a scania for that.
I wouldn't be believing what stagecoach say about anything really, Glenrothes are supposed to be using only 9700s on the X24, but often theres 1 or 2 Elites on it and the 9700s appear on the X59s instead. The E100EVs are only supposed to be on the Kirkcaldy Town Services but quite often they also appear on the 32 and 37s. Aberhill atleast have managed to keep there 9700s only on the X27s but thats only because not all express drivers have been given training on them so far, otherwise you would see them appear on the X61.