Butterflies mating?

After today's rain, I took a walk around Strathclyde park, on my way back to the car I noticed about 20 or so white butterflies flying about, I ventured off the walking route to get a closer look, stood for ages for one to land, kneeling down to this wild flower and hoping one would... Well I was almost giving up when one landed, heart thumping I focused the lens ( 55-200mm) took a few shots and to my surprise this other one appeared into shot, it's not perfect as you'll see, but I thought it made a good blipfoto, entry!! And I think they could be trying to mate??

Here's hoping its sunny tomorrow ( although I very much doubt it) lol