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I agree with Gadget & Wiggy but like yourself I cannot find a marriage record on SP. The only record of a Margaret McCutcheon (using margaret MCCutch*) marrying someone named Smith was in 1900 (James Smith in Old Cumnock).

Could it have been an irregular marriage ?

1) ANNIE MCMANUS ALCROFT married Samuel MCNICOL 1937 606/ 34 Registered in Monkton & Prestwick
2) ANNIE MCMANUS ALCROFT married FREDERICK JAMES HOLLANDS in 1945  606/ 113 Registered in Monton & Prestwick
3) ANNIE MCMANUS ALCROFT married WILLIAM MACK HERCUS in 1947 606/ 7 Registered in Monkton & Prestwick

I know this is an old post but I've finally gotten answers to some questions regarding these Alcroft women
No 1 & No 3 are the same person Annie McManus Alcroft born 1915 the daughter of Alexander Alcroft and Annie Mcmanus (Samuel McNicol obtained a divorce in 1945)
No 2 is the niece of No.1 and was born in 1922.She is the  daughter of Rebecca Alcroft  - no father is listed on the birth registration - Annie no.2's  sister is Alice Mcmanus Alcroft (again no father listed on her birth registration.)

My thanks to Hullnow for providing the Birkenhead link as Alexander Alcroft was proving elusive - he claimed in 3 different cesnus records to have nee born in Scotland but gave a different location each time - but there was a suitable candidate born Q3 in Birkenhead

A quick search gives the answer - "it depends" 

Apparently in some areas the registration began in the 1860's while it did not come completely into force over the majority of the country until the 1920's

Alberta
   Birth 1889, Marriage and Death 1898
British Columbia
   Birth, Marriage and Death 1872
Manitoba
   Birth, Marriage and Death 1882
New Brunswick
   Birth 1801, Marriage and Death 1888
Newfoundland
   Birth, Marriage and Death 1892
Nova Scotia
   Birth, Marriage and Death 1864, Births and Death not recorded from 1876 to 1908
Ontario
   Birth, Marriage and Death 1869
Québec
   Birth, Marriage and Death 1926
Saskatchewan
   Birth, Marriage and Death some 1889, but not all until 1920-30
Northwest Territories
   Birth, Marriage and Death 1940
Nunavut
   Birth, Marriage and Death 1999
Yukon
   Birth 1895, Marriage and Death 1899

Its 1794 in the C of S OPR's - Mary Flettcher and Willeam Boys in the parish of Tundergarth.

My first thought was a Frame Reference number but that doesn't match up with No Image possibly best to drop off an email to Scotlands people and ask for clarification.