I believe the attached photo's are that of a adult female Purple Hairstreak Quercusia quercus. The reason for my requesting confirmation is that after looking on the internet there are apparently several species of Purple Hairstreak each with a slightly different latin name and there is also some damage to one of its wings
I found it in Potteric Carr Nature Reserve nr. Doncaster in South Yorks. It was in a grassy bottom of a hedge consistingly mainly of Hawthorn and Blackthorn but with the odd small Oak within it. On one side of the hedge was wet mixed grassland and on the other a newly planted embankment to a dual carriage way.
I agree with your ID but Favonius quercus Its the only Species of Purple Hairstreak in the UK and the markings are spot on nice photographs both upper and lower wings any chance if you post further pictures to down size 22.5 MB took 11 minutes todown load here in the Pyrenees
PS I see the confusion its the same creature but the latin name has changed
The latin name changed in 2011 from Neozephyrus quercus also known as Quercusia quercus and previously Thecla quercus to Favonius quercus
Makes life confusing all internet posts will have to be updated including half my books lol