Mustpost said;
a 70 mile float from 26000 seems a 'little' optimistic
I agree. The problems started at 26,000 ft but the ejection was at 20,000ft according to the Times report. The weather forecast in the Times for the day of the accident predicted a westerly wind, and a strength of fresh to strong. It therefore seems highly unlikely that an ejection over Kingussie at 20,000ft would result in a parachute landing 70 miles south near Callander. Also, the pilotless Scimitar with hydraulic failure would have to have covered almost the same distance southwards, then manage to crash on a steep south-facing slope. I think it's more likely that the pilot ejected somewhere north-west of Callander.
Viking 1948 said;
Lt. N. Grier-Rees ejected at 26,OOOft came down safely on the 2,300ft snow‑covered Ben Bhreac, then over several days walked 13 miles before reaching a farmhouse at Callander, Perthshire
My best guess based on the article in the Times, the report referenced above and my experience walking the mountains in that area would be that the pilot landed on Beinn Bhreac, then descended south or south west to the Allt Brhreac-Nic and followed this stream eastwards until he spotted the small reservoir near Arivurichardich where he sheltered in a hut. When the snow eased, he would then have followed track next to the Keltie Water southwards until he reached one of the farms 2 miles north Callander (perhaps Braeleny or Thomasgreen?). The distance is a lot less than 13 miles (more like 5 or 6), but I expect that the terrain and weather conditions would have made it seem like a much greater distance.