ID help please

[Slugworth]

Hello everyone. I saw this butterfly on the 9th June at Yealand Hall Allotment in Silverdale, Lancashire.
I'm guessing a Northern Brown Argus but the spots on the hindwing are still confusing me ..... thanks in advance Chris

[bugboy]

Yes thats a NBA. Seems to be missing a spot or two on the underside but that's not too unusual amongst the 'Blues'

[Slugworth]

Yes thats a NBA. Seems to be missing a spot or two on the underside but that's not too unusual amongst the 'Blues'

Thanks bugboy, I had mixed responses from people so it's reaffirming to know you also think it is. It's the first one I have seen so I'm very happy. Thanks for your help