One thing to keep in mind, when I was in Scotland during the high season I think I talked to more Germans, who were there on holiday, then when I was in Germany (not necessarily a bad thing). Although, I was never put out for a night (it was close once), Scotland is a major vacation destination for Europeans and accommodations can be tricky. The hostiles were full and typically it was something like 28 Germans, me, and one or two Aussies. When I was there it was unusually warm and dry but I seem to remember two rainy days so I don't know if you want to completely count on camping either.