Steve, To address your follow-up question...
To make use of records you are going to need more information but as a start below are the marriages of male "peacock"s in manchester in the 20 years before Margaret's birth:
Marriages Mar 1923
Peacock Abraham Tittle Manchester 8d 225
Marriages Jun 1925
PEACOCK Charles E Fleet Manchester S 8d 414
PEACOCK Samuel Cutts Manchester S 8d 3
Marriages Jun 1926
Peacock Edgar G Briscoe Manchester N 8d 1058
Marriages Sep 1926
Peacock Alfred Barber Manchester S. 8d 14
Marriages Dec 1926
Peacock Abraham Speet Manchester N. 8d 706
Peacock James Williams Manchester N. 8d 734
Marriages Jun 1927
Peacock Alexander Bertenshaw Manchester N. 8d 1213
Peacock Ernest Fern Manchester S. 8d 101
Peacock Herbert S Ferneyhough Manchester S. 8d 547
Marriages Mar 1928
PEACOCK Frank A Curtis Manchester South 8d 223
Marriages Jun 1928
Peacock Charles R D Meachin Manchester N. 8d 1053
Marriages Sep 1928
Peacock Charles Taylor Manchester S. 8d 545
Peacock Frederick Hartshorn Manchester S. 8d 330
Marriages Dec 1928
Peacock Samuel Smith Manchester S. 8d 357
Marriages Mar 1929
Peacock James H G Valovitch Manchester N. 8d 859
Marriages Jun 1929
Peacock Ernest Littlewood Manchester S. 8d 145
Marriages Sep 1929
Peacock Henry Horricks Manchester North 8d 1512
Peacock Thomas Glennie Manchester North 8d 1565
Marriages Sep 1930
Peacock Harry L Jones Manchester S. 8d 30
Marriages Dec 1930
Peacock Albert Mosley Manchester N. 8d 829
Marriages Jun 1931
Peacock Charles Jones Manchester S. 8d 235
Marriages Dec 1931
Peacock Arthur Sarson Manchester N. 8d 878
Peacock Tom F Travis Manchester S. 8d 181
Marriages Dec 1932
Peacock John Evans Manchester S. 8d 310
Marriages Jun 1933
Peacock Edward Adey Manchester S. 8d 511
Marriages Sep 1934
Peacock Robert Baker Manchester N. 8d 1371
Marriages Mar 1936
Peacock Stanley Beesley Manchester S. 8d 213
Marriages Jun 1936
Peacock Joseph Jackson Manchester N. 8d 1227
Marriages Dec 1936
Peacock Harry P Shipton Manchester S. 8d 303
Marriages Sep 1937
Peacock George H Byrne Manchester N 8d 1549
Marriages Dec 1937
Peacock John R Dale Manchester S 8d 222
Marriages Dec 1939
Peacock Henry Storrow Manchester 8d 904
Peacock Thomas Ross Manchester 8d 519