More from the Gravel Pit meadow

I popped to the Gravel Pit meadow this lunchtime. There were quite few folk there, seemingly to watch birds. I saw very few cameras.
My blip for today was I thought a female Common Blue but when I did a little research on line I’m now not so sure and I think it may be a Brown Argus. 
I’m also posting and extra that I thought was white but now see it has a slight yellow tinge and I can’t identify what it is. Any help appreciated.