How might I locate my English mother's 1929 birth record when it doesn't seem to exist?

[Airlane1979]

My mother, Jean Allinson (or Allison) was born in England in 1929. A search on ancestry.co.uk finds nothing until her second marriage, to my father, in 1963. Can someone advise me how I might locate her birth record and anything else likely to be available?

 

[Ellie7]

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[Airlane1979]

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[brentor boy]

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[Airlane1979]

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[ptjw7]

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[brentor boy]

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[brentor boy]

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[Airlane1979]

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[brentor boy]

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