After asking about that on Bee-L I received a private email informing me it was Linaria vulgarius. 
It’s called by a common name ‘Butter and Eggs’ around here.  In those years when queens are 
painted yellow, foraging bees can make a real chore out of finding her.
 
Here’s a photo:

http://www.hlasek.com/foto/linaria_vulgaris_a140.jpg

(I know that’s not a honey bee.......)

Regards,
Dick Allen

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