The blue pollen there looks like Phacelia. It is quite widely planted by gardeners, bee enthusiasts and even on a field scale. I was delighted to see a field appear recently near one of my apiaries and less pleased to find out that the farmer mowed it in full flower. Rosebay willowherb is more of a slate grey/blue and due to the huge size of the pollen grains the loads have a rough surface.
There is a picture of the pollen load in this earlier discussion:
http://www.sbai.org.uk/sbai_forum/sh.../page277&pp=10
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