Adult Peacocks fly July to September, this one will have come out of hibernation. To find out more see UK Butterflies page: Peacock
There is a lot of action around the nest boxes at the moment as the adult males and females come and go bringing food and leaving to fetch more for the chicks. I’ve had five or so at a time in the garden fighting over food. To find out more see the British Garden Birds page: Starling.