Pieris napa ?

Pieris napa ?

Observation - Pieris napa ?. Description: I was looking for Pieris napa, but the weather wasn't playing ball. There were none in flight. I found this individual on I think it was marsh marigold as well as, surrounded by (definate i.d) cuckoo flower. I'm not 100% sure its green-veined white, so I'

I was looking for Pieris napa, but the weather wasn't playing ball. There were none in flight. I found this individual on I think it was marsh marigold as well as, surrounded by (definate i.d) cuckoo flower. I'm not 100% sure its green-veined white, so I'll say it's likely to be this.Positive i.d please.