I bought this anthology second hand around 1973 or 4. It had a massive impact on me, completely reframing what I thought SF was. Langdon Jones magnificent 'Eye of the Lens' immediately caught my attention, as did D M Thomas' 'Mr Blake's Songs of Innocence'. Both of these pieces have stayed with me as touchstones for adventurous thought and writing. Indeed, over the years I have come to appreciate Thomas' work more and more deeply.
Whilst those two items might be considered some of the highlights of this anthology, much of the other material is similarly robust. 'The Killing Ground' introduced me to the writing of J G Ballard, who remains one of my most important authors; as well as M. John Harrison, Hilary Bailey, John Clute and Christopher Priest all of whom I have followed to varying degrees. Michael Moorcock I was already familiar with, and in a few short years I was to become a devoted fan of the chronicles of Jerry Cornelius.
As an introduction to the British 'New Wave' SF of the 60s and 70s this anthology is a useful starting point.