Try Buddleja globosaX 'Salmon Spheres'
it will be one of the crosses between globosa and davidii
B. globosa is great for honeybees as the flowers are shorter than B davidii and they can get their probosces in. Worth getting for that alone, but if there are other colours you liek even beter I daresay the bees won't mind. Good luck
Is it buddleja x weyeriana bicolor.
Weyeriana are usually more yellow but that one has more pinky purple.
So after all your help I have come across the answer, to do with pollination: they are buddleya globosa bicolour yellow and orange, which turn pink/red once they have been pollinated by the bees/butterflies, to tell them they have no more nectar: what an interesting and beautiful thing to learn