In Old Wood near Doddington & Skellingthorpe in Lincolnshire, the Peacock Butterfly hibernates in Pine log piles.
It emerges at about this time (Mid to late March 2018) and can be seen basking in sunshine on the felled pine. Territorial chases then can continue.
My favourite Peacock Butterfly picture of 2017, was the very last over-wintered Peacock Butterfly I saw of 2017.
It was on the south west facing side of the woodland edge where the afternoon sunshine, was:

- June 17th 2017, Lincolnshire.
After speaking to a friend,though the picture was taken on private land (just away from a public footpath), access was permitted through a friend of a friend on that occasion.
(iPhone recording details included).
In the future, for Butterfly Conservation records, I thought similar important date related sightings (also to do with climate change) would be best, if camera recording details could not be manipulated without it being obvious.
I think that the following video link is very helpful for ones understanding of the Peacock's flight times in 2017:
1st july 2017
https://www.youtube.com/watch?v=OlJS_YwRnco&t=6s
"I don't think
wild Peacock Butterfly flight times overlapped between the 2016/17 brood and the 2017/2018 brood in Lincolnshire".
Also, thank you (in advance) Hazelwood Landscapes for booking in some time to talk as guest speakers, at the Lincolnshire Butterfly Conservation's Spring Indoor meeting.