I believe Bealine is used by British Airways tugs at Heathrow.
Jet2 still uses Channex.
About a hundred years ago Northeast Airlines (the British one) was using either Norjet or Norprop regardless of aircraft type. I don't know why they didn't use Northeast. Then after the BA amalgamation the callsign was variously Albion or Bealine until about 1980 when Speedbird found its way to the Regional fleet.
This subject was discussed on here about ten years ago so it may be in the archive. I started it !