These are some of the abbreviations commonly used in the notebooks.

(Ministers may be referred to either by their initials or their posts, usage is inconsistent)

A.H.  Antony Head
A.J. Aubrey Jones
A.L.B. Alan Lennox-Boyd
Alp., Alport Cuthbert 'Cub' Alport
A.N. Allan Noble
Att.G. Attorney General
B.C., J.B.C. John Boyd-Carpenter
Beeley Harold Beeley
Birch or N.B Nigel Birch
C., Carr., Carrington Lord Carrington
C.A.S. Chief of the Air Staff 
C.H., Ch. H. Ch. Hill Charles Hill 
C.I.G.S. Chief of the Imperial General Staff
C.N.S Chief of Naval Staff
C.O.S. Chiefs of Staff
C.S. Christopher Soames
Ch.Wh. Chief Whip
D.E. David Eccles
D.S. Duncan Edwin Duncan-Sandys
D.W.S., D.W-S., W.S. Derek Walker-Smith
D.V., Vosper Dennis Vosper
E.H. Edward Heath
E.M. Ernest Marples
Erroll Frederick Erroll
G.Ll. Geoffrey Lloyd
G.W.  George Ward
G.W. Gerald Wills
H. Lord Home
H.A Derick Heathcoat-Amory
Hail. Lord Hailsham
H.B. Henry Brooke
H.F.  Hugh Fraser
H.M. Hugh Molson
H.W. Harold Watkinson 
I.M. Iain Macleod
J.E.S. Jocelyn Simons
J.H. John Hare
J.S. James Stuart
J.M. John Maclay
K. Viscount Kilmuir
L.P. Lord President (of the Council)
L.P.S. Lord Privy Seal
J.T. James Purdon Lewes Thomas
K.  Viscount Kilmuir (David Maxwell-Fyfe) 
Low Toby Low 
L.P. Lord President (of the Council)
L.P.S. Lord Privy Seal
Ll.G. Gwilym Lloyd-George
Lloyd, Ll. Geoffrey Lloyd
M. Lord Mills
N.McP. Niall MacPherson
Newt. Lord Newton
O.Ewing Ian Orr-Ewing
P., Perth Earl of Perth
P.M.  Prime Minister (Harold Macmillan)
P.M.G. Postmaster-General
Profu. John Profumo
P.T. Peter Thorneycroft 
R.A.B. R. A. 'Rab' Butler
R.C., R. Carr Robert Carr
R.M. Reginald Maudling
R.T. Robin Turton
S., Str., Strathc. Lord Strathclyde (T.D. Galbraith)
S., Selk. Earl of Selkirk
S.Ll. John Selwyn-Lloyd
Soames Christopher Soames
W.D. William Dickson
W.M Walter Monckton
W.S. Derek Walker-Smith
V.M., V-M. John Vaughan-Morgan