Not my report, but a film by Dominique Peltier and 3 friends riding from the south of France to tour the Scottish Highlands in May on 2 airheads, a Himalayan and a 1200 GSA. Beautifully filmed and worth a watch, particularly on how to enjoy a trip despite the weather.
https://www.youtube.com/watch?v=Kbqm1YcT_Dk
https://www.youtube.com/watch?v=Kbqm1YcT_Dk