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. Anthony Head
A.J.  Aubrey Jones
A.L.B.. Alan Lennox-Boyd
Alp. or Alport  Cuthbert 'Cub' Alport
A.N.  Allan Noble
Att. G. Attorney General
B.C. or J.B.C John Boyd-Carpenter
Beeley  Harold Beeley
Birch or N.B. Nigel Birch
C., Carr. or Carrington Lord Carrington
C.A.S Chief of Air Staff
C. H. or Ch. H. or 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. or W.S.  Derek Walker-Smith
D.V. or Vosper  Dennis Vosper
E. H. Edward Heath
G.  David Gammans
E. M. Ernest Marples
G.Li  Geoffrey Lloyd 
G.W. George Ward
G.W.  Gerald Wills 
H.  Lord Home
H.A.  Derrick Heathcote-Amory 
Hail.  Lord Hailsham
H.B. or H.Br.  Henry Brook 
H.M. Harold Macmillan (P.M. from 9 January 1957)
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 (David Maxwell-Fyfe)
L.P. Lord President (of the Council)
L.P.S. Lord Privy Seal
LI.G. Gwilym Lloyd-George
Lloyd or Ll.  Geoffrey Lloyd
M.  Lord Mills
O.Ewing  Ian Orr-Ewing
P. or Perth  Earl of Perth
P.M.  Prime Minister (Anthony Eden to 9 January, Harold Macmillan from 10 January)
P.M.G.  Postmaster-General
Profu.  John Profumo
P.T.  Peter Thorneycroft
R.A.B.  Richard Austen 'Rab' Butler
R.C. or R.Carr   Robert Carr
R.M.  Reginald Maudling
R.T.  Robin Turton
S., Str. or Strathc.  Lord Strathclyde (T.D. Galbraith)
S.Ll.  John Selwyn-Lloyd
Soames  Christopher Soames
V.M. or V-M. John Vaughan-Morgan
W.D.  William Dickson
W.M.  Walter Monckton
W.S.  Derek Walker-Smith