Pyronia tithonus Gatekeeper or Hedge Brown
The Gatekeeper or Hedge Brown feeds on various grasses like Festuca ssp and Poa ssp but at this site it flitted amongst the flowers of the bramble and often settled on bracken or bramble leaves. It is an agressive butterfly and was often seen chasing off Red Admirals, Ringlets, Large Whites and Meadow Browns.
The female on the right seems quite interested in the bramble flowers and wherever we saw flowering brambles we found Gatekeepers and Meadow Browns.