I think its possibly a Green Woodpecker,they hammer with their bills on the hive entrance then eat the bees as they come running out to see what all the noise is.
Kings Seeds phacelia also in smaller packs (£1.50) to cover 25 sq.m mosts garden centres have them look for there other green manuare seeds too(eg. Buckwheat,Crimson Clover) kingsseeds com