Claim: New Writings in SF 18 planned to be edited by John Carnell and published in 1971 by Dennis Dobson.
Evidence: New Writings in SF 18 is an anthology of science fiction short stories edited by John Carnell, the eighteenth volume in a series of thirty, of which he edited the first twenty-one. It was first published in hardcover by Dennis Dobson in June 1971, followed by a paperback edition issued by Corgi later the same year. 
New Writings in SF 18 John Carnell Dennis Dobson 1971