I'm in a playful mood today. Two days in a row of marvelous Spring weather.
Of the three Scandinavian countries, Denmark was the one that was not in love with American trucks and busses nor even Swedish ones. They used a ton of British vehicles, some German and, one at least, of their own. Makes it a bit more difficult to answer the puzzle.
However, even though I did not find your photo, I did find some others and wonder if the bus in question might be a Danish Triangel?
Bill