Comma butterfly

Out walking the other afternoon I was amazed by the number of butterflies around, mainly flitting between flowers in the large hedgerows on the edge of a wooded area.
They were quite active and getting close enough (with the DA18-135) before they flew off again was quite a challenge !
The large whites in particular were very evasive, only stopping for what seemed like milliseconds before flying off again.
Fortunately the Commas seemed more sedate in their feeding habits and I was able to get this one in an upright pose !

Can anyone identify the flower, bush for me ?

K50 on Tv + DA18-135WR, hand held