(24 Jan 2020, 3:14 pm)BeachBoy99 For starters, "angel" is a much more frequent service than the X21, so the chance of its vehicles being spare is next to nothing. Plus, the X21 isn't an "angel" service. The OmniDekkas, at least, are corporate branded and still represent Go North East's standard image rather than confusing passengers with an "angel" branded vehicle, who think the next 21 is about to pull into a busy Durham bus station, for instance.
(24 Jan 2020, 3:14 pm)BeachBoy99 For starters, "angel" is a much more frequent service than the X21, so the chance of its vehicles being spare is next to nothing. Plus, the X21 isn't an "angel" service. The OmniDekkas, at least, are corporate branded and still represent Go North East's standard image rather than confusing passengers with an "angel" branded vehicle, who think the next 21 is about to pull into a busy Durham bus station, for instance.