Was at Coll and Colonsay recently.
No, there is no gravel or any other area for aircraft to be parked outside the circular apron at both airfields. At Colonsay there is a small fenced off area on the grass with large concrete tie down blocks for the Laird's aircraft. Coll has a real problem with greylag geese; they are now resident the whole year on the island, inhabit the airfield, crap all over everything and are practically impossible to scare away...
Glenforsa was immaculate as usual and Oban very friendly and helpful.