I can add a little information to some of what was said above :
Dougie had met up with 3 North of Ireland musicians in Brittany after quitting the "Tannies". They were Desi Wilkinson – still playing with "Cran",- and also fiddler Paddy O'Neill and a banjo player who I never met. They all went over to Belfast, and Desi, along with a singer/guitar-player known as "Cos" came over to Scotland with Dougie, first to Dunkeld, then to Aberdeen, Inverness and the Thurso Folk Festival. We then headed over to Ullapool and stayed there busking for the best part of a week before hitching back to Dunkeld. Desi and Cos then managed to get a single lift all the way to the South of France. Happy days – would have been 1977, I reckon, and "Caledonia" was sung many times in that 10 days or so.
[ Bloody hell – that's 30 years ago !!! ]