This page covers connection to Skye on 12th and 19th September via the West Coast Main Line and Glasgow.
Saturday 12th Sept from London and stations on the West Coast Main Line
You can take an earlier train leaving Euston at 06:05 arriving Glasgow 10:59 which connects with the West Highland Line to Mallaig or you can take this train and continue by Citylink bus:
From Glasgow Central it is a 0.6 mile walk to Buchanan Bus Station for buses to Skye
and alternatively there is a local bus connection.
Citylink timetable: Glasgow Buchanan Bus Stn 15:00 - Broadford 21:00
Saturday 19th Sept to West Coast Main Line destinations and London
Citylink timetable: Broadford 08:22 - Glasgow Buchanan Bus Stn 14:04