Whilst we're on the subject, Didn't the 35 terminate at Sighthill, before extending to the Airport? There was a photo on suzyscott.com from 2002 ish of an Olympian showing just this (it was around the time First still ran an 11 to Ocean Terminal)
Suzy's is a great site/ resource.
Sighthill used to be the terminus for the 34/35 as well as the 22/25, in the days when the 61 was the bus running beyond there to Herriot Watt (City to Balerno via A71, Sighthill, Herriot Watt and Currie).
The post-deregulation service saw a half hourly LRT 22 extending beyond Sighthill, this was then replaced by a half hourly 65 (which ran directly along the A71, so provided a faster service to the University, as well as attacking the City Sprinter services on the Restlerig - Wester Hailes corridor - C5/C50/ C55).
The 65 was replaced by extended 25s (in the 2000 changes), but then other services gradually extended to the University too, so the 34/35 all do now.
can anyone tell me what route the 28 used to take to get to Clovenstone? There are next to no photos of it online.
The 28/29 was the '90s version of the 17/47 - a loop round Muirhouse - Crewe Toll - Stockbridge - Mound (though the 17/47 terminated at the Meadows IIRC). The Muirhouse loop was essentially the path taken by the 24 and 47 (but without the Gas HQ section) in a circle.
IIRc the 28 and 29 were both every fifteen minutes in the early days.
The Eastern Scottish C1 was more direct into the scheme (like the current 37 to Pennywell), so Lothian retaliated by reducing the 28/29 (half hourly each) and running a 30 (every fifteen minutes, the route was similar to the modern 37).
The 30 became replaced by the 81 (every ten minutes from Muirhouse to St A Square, every half hour beyond there direct to Penicuik).
The southern bit of the 28 (to answer your question) was similar to the current 35 from Greyfriars Bobby to Slateford then Longstone and into Wester Hailes via the current 33 route.
The 29 was withdrawn, the 28 became every twenty minutes (on the "24" side of the Muirhouse loop), eventually the arrival of the 30 along Murrayburn Road killed it off.
The frequency up the Mound these days is fairly sparse compared to what it used to be - e.g. the 28/29 were eight buses per hour, the 42/46 were four buses per hour, the 45 ran that way, the 89... now there's a half hourly single decker on the 42 but no 28/29/45/46/89 (the 23/27 are still around, of course).