Mystery Flower - Bee heaven

At my Dad's this afeternoon - picked loads of fresh fruit and veg and took some amazing photo's of our haul, also took some great photo's of a Blackcap, Woodpecker and Dunnock - really spoilt for choice on the Blip front. However, the scenario that really caught my eye was that our local bees were going mad for one particular plant - I would never have guessed it - can you...................