Really is this yellow

I have this one too, well think i do mines just called 'Rajah' is it the same plant?

They are so similar, Rajah is quoted as scented, don't know about R B. Rajah Brooke is supposed to have a more intense colour, because less haft markings. So who knows!

Mine popped up in the garden a couple of years after moving here, old allotment land so someone must have grown it on there, I spotted it at a garden centre one day,think I named it right, not quite flowering yet.

Lucky you.