The Blue Bee?

Today a friend and I had a lovely day out at Hardwick Hall in Derbyshire, an amazing house with an amazing history. We enjoyed looking around the house and as the weather was very pleasant  a wander round the gardens was most agreeable.  I particularly liked a small wildflower meadow and took photos of some lovely Snake's Head Fritillary flowers, However, we were astonished to see a Blue Tit apparently feeding with its head inside these large Imperial Fritillary flowers. There was no signs of insects so we could only surmise it was feeding on pollen or nectar.