However, honey bees are very keen on broccoli as well. I think the flowers are probably similar to oil seed rape.
When you see bees like this you can understand how pollination works.
Common carder bumblebees like broccoli as well, probably because the flowers suit their tongue length.
And yesterday the first male red mason bee (Osmia bicornis).
The broccoli flowers are good for lazy honey bees as they don't have far to fly.