What butterfly is this?

What butterfly is this?

Observation - What butterfly is this? - UK and Ireland. Description: I was on a walk with my mum and my dog. It was quite a warm day and coming towards the end of the walk I found this butterfly on some leaves in the shade, I took a photo of it too. The butterfly was quite large and was a chesnut brown with black wingtips

I was on a walk with my mum and my dog. It was quite a warm day and coming towards the end of the walk I found this butterfly on some leaves in the shade, I took a photo of it too. The butterfly was quite large and was a chesnut brown with black wingtips and yellow speckeles at the end of its wings.