No doubts about it this time. No. 2 is Potanthus trachala. The little overlap of spot 4 & 5 with the subapicals & spot 3, the deeply indented margins and the dark spots are obvious.
I was caught out with Brian's pics because I thought it was a small skipper and had mentally blocked out P. trachala.
One is much more exciting.
I believe this is Pelopidas agna. It is a larger species. P. mathias has a strong grey tinge to the ochreous ground colour making it appeared dark.
However it will be necessary to check the upperside for confirmation.
It is not considered rare, and feed on the same grasses.