Identify please

I’m generally not very good with capturing butterflies, but I am pleased I got this one, following the return from our weekly walk in Portobello (see extra).

Any help identifying this butterfly will be much appreciated.

Update: coincidentally, this appeared in today’s Guardian newspaper: https://www.theguardian.com/environment/2023/aug/31/vintage-butterfly-summer-britain-whats-going-on

Have a good day all.