WHBM
There were actually only 3 colours
Each aircraft had three shades of the colour from dark at the bottom to light at the top.
The whole point of the colour change was to make the airline have a holiday image instead of the normal airline white with a blue stripe !!
The Red/Pink represented the sunrise getting light towards the sky.
The orange was the sandy beach
And the blue was the sea.
The whole scheme was designed by a Peter Murdoch Associates who used to turn up for meetings in a psycedelic painted mini and they wore full length fur coats.
In those days this caused a few raised eybrows in Hurn !!