easyGroup which includes easyJet is another where the exact colour pantone has been registered.
I'd say that that was reasonable. It isn't an absolute ban on others using orange (
BA» can still serve orange juice of their flights for example and a mobile phone operator can use the exact same colour in their brand), but if another airline started branding their planes in the same orange theme, then you could see that the public might genuinely see an association between Easyjet/Easygroup and those planes. If there was no such connection the public would be being mislead and EasyGroup's brand would be being diluted. It is that kind of thing that their registration would stop.
Where it gets interesting is where a colour has become so distinctive that it causes the public to make a connection even when the colour is used for different goods.
So if I won the next
GW▸ franchise and decided to paint all of the trains in white and orange, I would bet that a good proportion of the travelling public would think that the trains were being run by EasyGroup/EasyJet even if the word "Easy" did not appear anywhere. EasyGroup have never run trains and have therefore not use their colour brand for trains. Should EasyGroup be able to stop my actions? What if their was evidence that people were attracted to my trains by the Orange/White branding expecting to find low cost fares and ended up seeing the high price and complexity of my tickets and being put off not just my trains but the whole EasyGroup?