Aidan Chambers edited the 10th & 11th Ghost Books, later published as:
The Bumper Book of Ghost Stories (Pan Books, 1976)
(Omnibus of The Tenth Ghost Book & The Eleventh Ghost Book)
Michael Delving - Recoil
Jean Stubbs - An Evening at the Cromers’
Dorothy K. Haynes - The Fort
L.P. Davies - End Game
Barry Sutton - The Tale of Caseley Halt
George Mackay Brown - Soldier From the War Returning
R. Chetwynd-Hayes - The Coloured Transmission
Peter Dickinson - Mystery Man
Brian Morse - A Jealous Ghost
Joan Aiken - Furry Night
Frederick Bradnum - The Lady of Long Lawns
John Burke - Leave of Absence
Albert Rowe - The Case of Dr A.D. Hunter
Victoria Williams - Rest in Peace
Christopher Leach - Private Meadows
Rosemary Timperley - Little Girl Lost
William Trevor - The Death of Peggy Morrissey
Victoria Williams - Refuge for the Heart
George Mackay Brown: The Pirate’s Ghost
Dorothy K. Haynes - Kiss of Life
Giles Gordon - Peake
John Rowe Townsend - Trying to Connect You
Petronella Breinburg - Na Jorka fo Bekoisi
Brian Morse - Hope Cottages
Frederick Bradnum - Folly
John Burke - The Custodian
Jean Stubbs - The Band in the Park
Christopher Leach - The Trouble With Nathan
The final two Ghost Books (the Twelfth and, appropriately, Thirteenth) were edited by Polly Parkin and James Hale, respectively. Again, Pan issued an omnibus volume:
The Second Bumper Book of Ghost Stories (Pan Book, 1978)
William Sansom - Preview
Gilbert Phelps - Call a Spade a Spade
Sylvia Sherry - Footsteps
Lance Salway - Undesirable Residence
Albert Rowe - The Question
Rosemary Timperley - Out of Sight, Out of Life
R. Chetwynd-Hayes - Calvunder
Giles Gordon - In Spite of Himself
Dorothy K. Haynes - Matthew Lurk, Tractorman
James Parkhill-Rathbone - A Shade Byronic
Margaret Potter - The Boy on the Bus
Steve Wilson - Ghosts There Must Be With Me in This Old House
Dulan Barber - Cuckoo
Kenneth Harker - Sport of the Oak
Donald E. Westlake - In at the Death
Eva Hanagan - The Uninvited
Peter Tinniswood - The Top Coat
Maria de Selby - Robe’s Mother
H.R.F. Keating - Mr Saul
R.B. Hart - Moving On
Giles Gordon - Horses of Venice
Fay Weldon - Angel, All Innocence
Graham Lord - The Poltergeist
Tom Caslon - Gravedigger
Crap covers, but the second gets points for effort.