The Hoverflies were feeding in the sun yesterday . After looking in the field guide from the photos and where they were feeding I think this is Eristalis nemorum they mimic bees.
The first photo helped to identify it because of its face shape..
They visit a wide variety of flowers and have a long flight period stretching into September.This hoverfly was definitely enjoying the flower.
I have added two short videos which really show how like a bee they look at first glance.