Scotland Bus Operations
Scotland Bus Operations
Not neccessarily useful if you arent in to that type of thing but i found this user on youtube by accident:
https://m.youtube.com/channel/UC6N4qxGGrdacA82lT4K7Mxg
It doesn't cover every route and most routes were filmed in 2013 meaning that some route changes could have happened but even then, they are still enjoyable (even without sound!)