I found this Small Tortoiseshell (Aglais urticae) on a cherry tree this morning in the Parkland. In fact I didn't expect to see any butterflies as the temperature was not really warm enough. High up in the tree it was not moving from that spot as it was enjoying the limited warmth from the sun on what was a cool morning. Having recently emerged from hibernation this is likely to be a male as it will habitually bask in the sun in the morning and look for females in the afternoon.
The male is smaller than the female, 50mm as opposed to 56mm.